Femanon here, adding to the "girl on top" debate.
I can't have an orgasm from sex without clitoral stimulation, and I can't rub my clit when I'm riding on top. It just gets unsynchronised and it's not worth the hassle because the bouncing doesn't let me hit my spots. By contrast, when the guy is on top of me, especially in missionary, it makes it much easier to rub my clit and therefore get off.
I have NEVER had an orgasm on top. EVER. Any guy who tells you it's easier for girls on top is a FUCKING RETARD. Or has dated a lot of chicks who fake orgasms (95% of them do, btw. Oops, sorry femanons, I'm blowing your cover with my TRUTHINESS).