the assumption that it is never long enough, hard enough, good enough?
i can't imagine having to apologize for every partnered orgasm.
when discussing sexual double standards, those faced by heterosexually active men are rarely addressed. the days of closing your eyes and thinking of england are over for the girls. women are supposed to concentrate on their pleasure. but men are expected to think of baseball stats and the queen of england to prolong their erection. they pay money to shroud their dicks in desensitizing lotion, while women burn their clits with "stimulating drops".
appreciate sex and appreciate your partners. enjoy a variety of play, including those that do not require an erection. focus on sensation, not the end goal of orgasm. don't keep score, but play fair by your partner.
explore, have fun, and never apologize for pleasure.