The point was that this is just a popular scenario. But it doesn't mean "this game is much interested in seeing Ian as a potential cuck and Lena as a potential slut" in particular, it's simply one of the options it provides the player with. (one for which there's known audience)You just proved me right, but by giving the example about porn stereotypes.
The game also provides option for say, Lena being faithful partner devoted only to her boyfriend, and for Ian to sleep around and cheat, but curiously this doesn't make you conclude that these paths are something "this game is [just as] much interested in seeing". Consider, why are you so selective in making your presumptions, then?