Compelling evidence from many animal taxa indicates that male genitalia are often under postcopulatory sexual selection for characteristics that increase a male’s relative fertilization success. There could, however, also be direct precopulatory female mate choice based on male genital traits...
So much for having a big dick as a manlet, you get less of a boost JFL
"Penis size had a stronger effect on attractiveness in taller men than in shorter men
There was a similar increase in the positive effect of penis size on attractiveness with a more masculine body shape (i.e., greater shoulder-to-hip ratio). Surprisingly, larger penis size and greater height had almost equivalent positive effects on male attractiveness. "
They used flaccid size in cm. Their largest setting was 13cm (5.1 inch) FLACCID. It seems like it wasn't optimal, bigger is still better
"Although we detected quadratic selection on penis size, any potential peak (i.e., the most attractive penis size) appears to fall outside the range used in our study. "
Your dick has to be TWO entire standard deviations bigger than average for it to be ideal
"the most attractive size appears to lie more than 2 SDs from the mean "
If you don't know what this means, this means you have to be bigger than 95% of men (at the very least since they said MORE than 2 SD). In a room with 20 other men, only one guy can be bigger than you.
But remember, men are the ones with unrealistic expectations
Here's a pic of standard deviations and how much it is in % of data