I'd argue the devil's advocate in that - people who prefer adult games aren't always looking for a quick nut. Sex is like a milestone. It's a form of communication and it can express a person's character. Better yet, a person who struggles with their ideals of sex can build onto their character. Coming across a sex scene isn't always a pants down experience for me. Personally, I see it more as a representation of how far we've come in terms of bonds & intimacy. I only play adult games because I'd be lying if I said sexual ideas do not entice me. It doesn't even have to "sex", it could be sexual ideas. I find a completely nonsexual VN to be boring, because it can add to romance and tension, not to rip on asexuals or anything.
I played through all of build 0.3 of MH twice not because of hoping I'd get to see Asterion naked or hoping he'd turn attractive (which I was totally right about :P), but because I actually cared for his well-being and was curious what would happen if you hadn't. Heck, I didn't even enjoy Luke's CG. Anyways, I hope that helps any creators or generate some food for thought. :)