Honestly? How much unnecessary guilt women carry around with them over everything.
First girlfriend I had (18 at the time) everytime I did something nice would either apologize or promise some kind of sexual reward. At first it seemed hot but after a few times in a row I just told her I wasn't doing nice things for a reward but because I cared about her. Made her cry and we talked it out afterwards but yeah after that (and just other things I talked to my female friends about) my eyes were opened to how invalid women seem to feel.