Of course, the range of activities comprising "sex" is stunningly broad, but I assume we're talking about the stuff that's 99% of the activity.
I think guys come out of the egg knowing that penile friction feels good. Add warm and wet - then it goes to great. While we certainly enjoy ancillary activities, the seat of our response is the dick. All-in-all, we're about as hard an equation to solve as 1 + 1 = ?
Then there are women, who are walking differential equations. Clearly, for most the clitoris (the full structure, not just the pearl) is response central. However, the range and intensity of that response is really broad. Plus, to varying degrees their whole body is an erogenous zone, including some who can have non-genital orgasms. And I've known women who had been married for years and had never had a real orgasm; but, once they learned how, could achieve multiples. (Would love to send a video to those poke-n-pump ex-husbands!)
So to me, guys fall into a narrower bandwidth than the ladies, in general. Like the above comment on 69, I know that the best intercourse for me has always been when the two of us are sensing and responding to the other - and to me that's what makes the feeling ever better for both of us.