Funny, usually the sexual gratification does not come up on the forum. I guess it's still taboo. Anyway, now that we're discussing it: it is definitely a factor for me, too. But not the only one! Don't think that your feelings are wrong, just because you do not understand them. Enjoy them, and learn from them! The fact that your sexual feelings are the most urgent, and the most easily adressed, does not necessarily mean they run the deepest.
And even if they did, that's cool too.