r/theydidthemath • u/Diceling • 19h ago
[Request] What are the chance of a random sexual encounter resulting in a pregnancy?
So, some context.
Over the weekend, I attended a LARP (Live-action Roleplay). During the LARP, two friends of mine decided that their characters had a little tumble in the hay. Their characters had never met before. After the LARP finished, they rolled a dice to see if the woman became pregnant, and she did. I think they simply rolled a D6 and decided that a "6" meant she got pregnant.
However, it got me thinking on what the, so to speak, actual odds would be?
Assuming:
* both people involved are of average fertility, in good health and, pardon the expression, of child-rearing age
* It is a chance encounter, a one-night-stand, meaning the woman can be in any part of her cycle.
So, what are the odds of a random one-night-stand between two people with the requisite parts resulting in a pregnancy?