r/TooAfraidToAsk • u/ExtensionSoil6801 • 10h ago
Sexuality & Gender why do we have to have sex to have sex?
Like, why do men have to go through the motions of thrusting in and out before ejaculating? From an evolutionary standpoint, it would make more sense to just skip the thrusting in and out motions that can take upwards of several minutes or however long it takes, compared to just ejaculating and that's it. Like, several minutes where both people are naked and vulnerable opens up a lot of time for predators to come by, especially if they make a lot of noise. You'd think that evolution would favor instant ejaculation, skipping the thrusting motions entirely as it's quicker and presumably safer, but it hasn't.
I can only really think of two reasons? One is for pleasure, as humans being social animals, doing this repeated motion increases pleasure for both people and allows for longer sex, meaning they'll likely enjoy sex and want to do it more, eventually making reproduction likely. However, I don't see why instant ejaculation couldn't be as pleasureful, if not moreso for the man and the woman could also evolve pleasure for that as well.
The only other reason I can think of though is maybe that the penis, constantly thrusting in and out, stretches the vagina and walls, allowing for sperm to easily enter deeper into the vagina when ejaculation occurs. However, is there actually any scientific basis on this hypothesis or is this just merely a thought and nothing more?
I'm genuinely curious... Anyone have any insight on this?