mating   1047

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Why did humans evolve big penises but small testicles?
Male gorilla are also much larger than females, but they have a polygynous or harem-style mating system where many females live with a single male. With little or no competition actually inside the uterus, gorillas have had no need for a testicular arms race to facilitate the production of more and more sperm. Their testes, therefore, are relatively small. This is similar to modern humans, whose testes are also of very modest size and produce a relatively small amount of sperm. In fact human sperm count reduces by more than 80% if men ejaculate more than about two times a day.

The human penis is large when compared with those of our closest relatives: chimpanzees, gorillas, and orangutans. However, primatologist Alan Dixson in his wonderfully detailed book, Primate Sexuality, suggests that if we look at all primates, including monkeys, this is just wishful thinking.

Comparative measurements show the human penis is not exceptionally long. The Hamadryas baboon, for instance, a native of the Horn of Africa, has an erect penis that is five and half inches long – slightly shorter than an average human male, but they weigh only a third of our weight.

The human penis is in fact extremely dull – it does not have lumps, ridges, flanges, kinks or any other exciting feature that other primates have. In primates, this lack of penis complexity is usually found in monogamous species.

Monogamy mystery

This observation clashes with the fact that men are significantly larger than women. This suggests our evolutionary background involved a significant degree of polygynous, rather than exclusively monogamous, mating. This is supported by anthropological data showing that most modern human populations engage in polygynous marriage. Anthropologists Clellan Ford and Frank Beach in their book Patterns of Sexual Behaviour suggested that 84% of the 185 human cultures they had data on engaged in polygyny.

However, even in these societies most people remain monogamous. Polygynous marriages are usually a privilege reserved only for high status or wealthy men. It is worth noting that hunter-gathers around the world practice only monogamy or serial-monogamy which suggests that our ancestors may have used this mating system.

At first sight, however, it would seem sensible for males to reproduce with as many females as possible. Human monogamy has long puzzled anthropologists, and lots of effort has gone in to working out what keeps males hanging around.

Three main theories have been put forward. First is the need for long-term parental care and teaching, as our children take a long time to mature. Second, males need to guard their female from other males. Third, our children are vulnerable for a long time and infanticide could be a risk from other males. So to ensure that children are able to reach maturity the male is likely to stay to protect them, both socially and physically. This may be why males have maintained their larger relative size.

If we view the evolution of monogamy mating systems in humans through the lens of human society it is clear that it takes a huge amount of social effort to maintain and protect more than one mate at a time. It is only when males have access to additional resources and power that they can protect multiple females, usually by ensuring other males protect them. So monogamy seems to be an adaptation to protect one’s mate and children from other males. This monogamy is reinforced by the high social cost and stress of attempting to do this for multiple partners, and it has become supported by cultural norms.

So when living in complex human societies the largest and most important sexual organ is the brain. Somewhere in our evolutionary past how smart and social we are became the major control on our access to sexual partners – not how big or fancy a male’s penis is.
testicles  penis-size  evolution  human-sexuality  mating  breasts  monogamy 
6 weeks ago by thegrandnarrative
First Time For Everything
Jensen looked over to where Jared was leaning against the pillar. He could smell the young man from where he stood. He still couldn’t believe that his best friend since they were mere pups turned out to be a beta. He could still remember the first time he met Jared. The younger pup was unable to shift into his human form, as that ability only manifested around the age of three.11,317
jensen/jared  J2  a/b/o  Omega!Jared  Alpha!Jensen  top!Jensen  bottom!Jared  mating  knotting  attempted!Rape/Non-Con  protective!jensen  jealousy  hurt!jared  werewolf 
8 weeks ago by Misspookielo
Cousins
t's Christmas and Jared Padalecki, 18 years old, is bored out of his mind at the annual family gathering. He never expected that his life would be changed forever when an older cousin he never saw before was introduce to him.3,338
jensen/jared  J2  a/b/o  Omega!Jared  Alpha!Jensen  mating  top!Jensen  bottom!Jared  first-time  knotting 
8 weeks ago by Misspookielo
Mine Forever
could you write about alpha!jensen and omega!jared that have been friends all this years despite the atraction they feel for each other until one night they went to a bar and some alpha douche started touching jared and jensen beats the guy and then they go back to their house and fuck? 0,772
jensen/jared  J2  bottom!Jared  top!Jensen  a/b/o  friends-to-lovers  jealousy  mating  knotting  first-time  NC-17 
8 weeks ago by Misspookielo
Lamb
The results of a recent blood test see accountant Jared Padalecki summoned to the CDC for tests, only to find that things are far from what they seem. Jared is a candidate, sought by a race of aliens. If that wasn’t bad enough, there are other countries who will go to any lengths to ensure that their candidate is the one, even if that means murder. Rescued, by who he believes to be Secret Service agents, Jared is whisked away to a house in Montana, owned by enigmatic billionaire Jensen Ackles and his unusual ‘family’. Who is Jensen Ackles anyway, and why is he so interested in Jared? 64,814
jensen/jared  J2  mating  bottom!Jared  top!Jensen  a/b/o  Omega!Jared  Alpha!Jensen  hurt!jared  protective!jensen  homophobia  bestiality  knotting 
8 weeks ago by Misspookielo
Banking On You
Jared’s family is in great debt to their mortgage bank. Trying to reason with the banker seems impossible. That’s when Jared offers Jensen Ackles something the man can’t possibly deny. Neither of them have a clue of the consequences they’re going to face once Jensen can’t say no to Jared any longer.32,194
jensen/jared  J2  bottom!Jared  top!Jensen  Omega!Jared  Alpha!Jensen  mating  knotting  mpreg  barebacking  attempted!Rape/Non-Con 
8 weeks ago by Misspookielo
Adventure Quest
A boy with a thirst for excitement, who will stop at nothing to become the adventurer he's always dreamt of being.
A hundreds of years old dragon, who has been terrorising the country for generations with its fiery wrath.

The day these two meet is the day everything changes. Especially Sam's peaceful life.
12,923
Sam/Dean  dragon!dean  first-time  mating  bottom!sam  top!dean  NC-17  unrelated  virgin!sam  dub-con  non-con 
8 weeks ago by Misspookielo
Knotting
Gay wolves aren’t accepted so Jensen formed his own pack. There’s Chris/Chad, Danneel/ Genevieve, Sophia/Sandy. To be different they were streaks of colored dye in their hair except Christ he has braids and beads. The color doesn’t transfer to their wolf forms. (No one wants to see a hot pink wolf except possibly Jared). Jensen is Priestly like with the tattoos and eyeliner and faux hawk in blue. It’s taken him a long time to track down his mate, a human named Jared. I’d like Jensen to rescue Jared from something with a good mating knotting story.
jensen/jared  J2  protective!jensen  a/b/o  Alpha!Jensen  top!Jensen  bottom!Jared  knotting  NC-17  first-time  mating  romance 
8 weeks ago by Misspookielo
Entwined Branches
In a world where the government keeps a close eye on alphas, betas and omegas -- to the point of making certain everyone with these traits is mated by the time they turn eighteen -- it's no wonder the condition has become rather rare. It is, however, essentially unheard of to be unmated at thirty-three, but Jensen Ackles is an alpha who's good at staying under the radar. That is, until he's not and he's matched -- by bureaucratic decree -- to 18-year-old omega, Jared Padalecki. This is the story of how the two of them find far more than they ever thought they could.
Author:strive2bhappy  Supernatural  Slash  fanfic  Jensen/Jared  Smut  Fluff  Angst  Hurt/Comfort  Relationship:Developing  Alpha/Beta/Omega  Omega!Jared  Knotting  SelfLubrication  Mpreg  ArrangedMarriage  Insecurity  Possessive  Jealousy  Mating  MatingCycles/InHeat  Length:50.000-100.000  OneShot  Romance 
april 2018 by Ambrosine8
Silk and Steel
As a child, Jared was gravely injured defending a young member of his pack against a poacher. Now, he walks with a severe limp in human form, and cannot run and hunt with the other wolves in his pack. He long ago accepted that he would never mate or have a family of his own. When the pack's alpha dies without an heir, distant alpha relatives come in from out of town to compete for the title of pack alpha. One of them is Jensen Ackles. When he sees sweet, dimpled Jared, he falls hard, but Jared knows his place well. He gently brushes off all of Jensen's attempts to woo him, reminding Jensen that he owes the pack a strong, healthy mate, not a gimpy omega. Jensen makes it his mission to convince Jared that he's the perfect mate for the pack alpha, and that he's worthy of everything.
Author:Fatebegins  Supernatural  Slash  fanfic  Jensen/Jared  Smut  Fluff  Angst  Hurt/Comfort  Alpha/Beta/Omega  Relationship:FirstTime  Omega!Jared  Mating  Claiming  Jealousy  Mpreg  Injury  AlternateUniverse-Werewolf  Insecurity  Misunderstanding  Length:20.000-50.000  MultiChapter 
march 2018 by Ambrosine8
I Think I Love You (But I Don't Even Know You)
After five years away on his mating quest, Jensen is forced to return home mateless and marry his best friend so he can become Alpha of his pride. In an ironic twist of fate, it is back at home that he finally finds his mate in the least acceptable person possible: Jared Padalecki, an outcast and half-breed.
Author:keep_waking_up  Supernatural  Slash  fanfic  Jensen/Jared  Smut  Drama  Fluff  Relationship:FirstTime  ArrangedMarriage  Mating  Alpha/Beta/Omega  Bottom!Jared  AlternateUniverse-Were-Creatures  Length:10.000-20.000  OneShot 
march 2018 by Ambrosine8
It Was Always You (Woke Up Sweating From A Dream)
Jared has pined for his younger stepbrother, Jensen, for so long that it has become difficult to remember a time when he wasn't pining. But when Jensen goes into his first rut, Jared can't bring himself not to help. Somehow he just couldn't imagine that it was going to hurt so much when Jensen didn't seem to remember.12,419
jensen/jared  J2  Omega!Jared  Alpha!Jensen  a/b/o  mating  first-time  romance  knotting 
february 2018 by Misspookielo
Dragon Touched
When a dragon-mate comes of age, the scales of their intended grow upon their skin. Custom dictates that they go to the nearest lair and seek out their mate. Jensen’s never came. 8,219
jensen/jared  J2  dragon  dragon!jensen  mating  bottom!Jared  top!Jensen  protective!jensen  angst 
february 2018 by Misspookielo

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