Throughout the human history, 80% of females end up reproducing, while only 40% of males do User TheHatim, in the Black Pill Science subreddit, 13 Feb 2019
There is a theory that only 80% of females and 40% of males actually reproduce (x-post from /r/todayilearned) User rinwashere, in the Forever Alone, Together! subreddit, 11 Feb 2017
TIL that because few men reproduce with many women, 2/3 of your ancestors are female, not 1/2. Also, overall throughout humanity 80% of females end up reproducing, while only 40% of males do User iamaquantumcomputer, in the Today I Learned (TIL) subreddit, 10 Feb 2017