It's a trope, but it's also supposedly "well known" that men are horny bastards who think with their dicks... yet somehow we have these the two very opposing scenarios.

Personally, despite a rather distinct lack of interest from the "fairer sex" prior to college, I found that plenty of women were more interested in sex than me in later years and not particularly subtle about it, which was actually off-putting as I wanted a relationship with a bit more substances. A lot of guys I know were in the same boat. Sex was easy. Finding somebody who actually wanted to do activities together was quite hard.