Andrew P. Smiler, author of Challenging Casanova: Beyond the Stereotype of the Promiscuous Young Male, rejects the idea that men are only interested in sex:
All of the research that we have show that it’s only a minority of guys who have multiple partners per year, and I typically talk about this as three partners a year because that’s the Casanova average. It’s actually a minority of guys who want multiple short-term partners — that even comes up in the evolutionary research. The evolutionary argument basically goes that guys have the ability, theoretically, to produce hundreds of children per year, and they can never quite be 100 percent sure that any child is theirs, so they should spread their seed widely. But what gets left out of that is the fact that if you want your genes to go beyond that next generation — beyond your children to your grandchildren, then your odds are better if you actually stick around and help raise that kid until that kid is old enough to pass on his or her genes.
As far as I can tell, they follow the same kinds of patterns. There are those gay young men who are trying to sleep with everyone they can, but it’s a minority of guys.