Hmmm this reminds me of Leisure Suit Larry (Magna Cum Laude) which i did give a try some time last year, and found the whole game seemed like a total cock tease.
So i guess to answer the question...
1) Men are wired for sex
2) Lots of gamers are male
3) Sex sells (or the hint of it)
4) If you hint that you don't get sex (except through your computer and therefore are a pervert) your testicles are removed/revoked by the community at large, shunned to live in a cave and die a virgin because the US has too many shitty laws about proper sex/reproduction education.
So i say: Bring a few mindless games with titties that i can view and be in awe in, and have some story/plot as part of the game preferably only needing one hand in order to play.
Keep in mind once we have our 2-3 games, having more will have diminishing returns unless they are good and somewhat innovative. I'd personally nominate Monster Girl Quest, where there's sex galore if you want it, or if you play to win often you'll just get the story most of the time. Perfect balance of willfully losing so you see the sex and intentionally winning to continue the game/plot.
Honestly at the end of the day if you get your rocks off by access to real boobs, fake boobs, or don't have rocks at all, it doesn't matter as long as it's treated like religion (as in, you aren't forcing it on someone else).