Pregnant because you have a big dick

nomju

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I once read a hypothesis that the shape of the head of a penis is such so that it can help drag another man's semen out of a woman. This was developed during cave man times when we were a bit rapey, and women were passed round, but we wanted the resulting babies to be of your blood. Then, through genetics, mens dicks got bigger.
A more likely scenario for a woman becoming pregnant purely because you have a big dick is a condom breaking.
My story is from the 90s. She couldn't go on the pill, for medical reasons. Plus, in those days condoms were 'one size fits all'. Stretched condoms over my fat cock would often break during long sessions. I was constantly checking their integrity, and replacing them when they perished, mid fuck. Until that one fateful, drunken night, when I pounded her, unchecked, for far to long. On pulling out, all that was left was the rubber ring round the base of my dick.
Nine months later, our beautiful daughter was born. We were ready. I was 30, my gf (now wife) was 28. She has since grown into a beautiful woman, and has a younger sister. But if my damn dick wasn't so big I probably wouldn't have burst the condom, and the birth would have been planned out.
One last aside. Do big dicks get women pregnant easier, because we deposit semen deeper into them?
 

Rican84

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No you just busted a fat load that got her pregnant. Everyday women are getting pregnant regardless of size
This. Size doesn't matter in getting a woman pregnant. What matters is how fertile you are.
 

halcyondays

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Plus, in those days condoms were 'one size fits all'.

Multiple sizes were available for decades before the 90s. They certainly were when my sex life began in 1980.

Then, through genetics, mens dicks got bigger.

There's something to this. Human males have the largest erect penis of all primates. Most primates have bodies which are physically smaller than ours and smaller penises because of it.

Even primates larger than us like orangutans and gorillas have smaller erections. Male gorillas average 3 inches erect. Size hasn't been selected for reproductive success. Breeding behavior has. Gorillas are a tournament breeding species meaning one male has a harem of females. Therefore his body size and strength are more important both to attract a group of females and fend off male competition as well as protecting his harem. If he is deposed the new male will kill all the baby gorillas still nursing so the females will dry out and come into season so he can breed them. This is why the large silverback males are so huge and intimidating.

Our species fits somewhere in between a violent tournament breeder like gorillas and a peaceful social breeder like bonobos where all the males share all the females instead of fighting over them.

Penis size in most mammals is dictated (no pun intended) by female reproductive anatomy which is why the vast majority of human males have an average erection size close to the average size of a human vagina.

Another consideration is sperm competition. A male with a high sperm count doesn't need a big penis because his sperm are the advantage not the size of his erection.
 

Robert Dole

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There are a number of ideas on the subject but within the last 10 years more researchers are tending toward the idea that there was or is some female selection as to size. It is interesting to note that the size doesn't matter theory turned up in the late 1960's when idealistic feminisim was commonplace in academic circles, and there was little real knowledge because it hadn't really been studied and women's sexuality wasn't discussed...
Bigger not always better for penis size - Nature
Penis evolution across species: divergence and diversity - Nature Reviews Urology

The last article relates to an alternative to the semen removal theory, and it is well known that the vagina is hostile to sperm- hence the theory that precum serves to prepare the way for sperm, assisting their survival
An Explanation for the Shape of the Human Penis - Archives of Sexual Behavior
 
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rob-c

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when I was around 19/20 I was fucking a woman around twenty years older than me. it was my first relationship that was purely about sex and where I could lose my inhibitons and pound away in missionary and doggy….she really brought me out of my shell sexually.

one night, she asked me if I had ever knocked anyone up. I was surprised and asked why. she said bluntly “because you have a big dick and you cum a lot”. she then advised me to be careful with girls my age.

she probably knew that there was no correlation between size and impregnation, but I think for her it was a form of dirty talk. she got off on the idea of me being young and potent.
 

Robert Dole

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The mother of my daughter was in her early 40's when I met her and still a total knockout, I was 23. She had married a guy in his 60s at 22 and was looking after him, but had most of a day each week where he was at his daughter's house, and she would book me in to clean. There was something between us right away and it wasn't long before she shyly asked me to join her in bed, while pressing up against me in the kitchen. I stood there for a moment feeling her soft breasts and hard nipples on my back, smelling an intoxicating mixture of light perfume and musk from her pussy, and my cock responded straight away. Once she felt my cock fully hard up she wouldn't let it go until she was sure it was going in her pussy- and doing everything she could to make that happen. The sex was incredible, just next level for both of us from the time I entered her and made even better by her exclamations as to how full she was feeling as she rode my cock, building up into series of spasms as she came, and again as she held me tightly
The days dragged until our next session, and I soon realised that squirting wasn't an urban myth when she came hard after I had bottomed out several times, encouraging me as I pushed in as far as I could.
We met several times on a weekly basis before she stopped riding to pull off the condom mid- session- I warned her it would be really messy but she reckoned that was fun she had missed out on with all the "poking and twiddling" for 4 years at the IVF clinic, and I realised it was something special she really wanted me to be involved in. She certainly showed her appreciation, draining my balls with her twitchy pussy in record time while having two very wet orgasms and all the time smiling and glowing like my bare cock was the best thing in the world.
We settled into a weekly bare session and after a few months she told me she thought she might be pregnant, just keep fucking me please was her her comment when I asked if she wanted a pregnancy test. Within a few months her nipples and areolae swelled up and pussy lips became prominent, no test required once she started to show...
 

mib348

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I have married a mid-thirties woman and i have not been able to knock her up for 3 years now due to my low sperm count & motility and i can't afford ivf/iui
 
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Robert Dole

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So is it possible for a young fertile boy to knock up a menopause phase woman?
As it happened, menopause didn't come along for another 6 years for her- fertility declines sharply for some women in their mid to late 30s and managing this is part of many fertility therapies. 20 years ago it was considered risky for women in their 40s to become pregnant but it is apparently better known now- I'm sure the obstetrician was quite relieved when the baby was delivered, because he took a hell of a lot of calls at night...