Flighty.
I'm having trouble typing the sound of an air horn signaling 'foul'.
Yeah, it was the wrong word. The point was that men--IN GENERAL-- want sex more, they want more of it, and they want it with more people. When you put two people like that together, their relationships are likely not going to be as stable as putting two people who are
not like that together, or putting one person like that with a person who isn't like that.
Stability, however, is not the end-all and be-all. If everybody wants to be slutty, then being slutty isn't a bad thing.