Hmmm i don't mind studying in the library, but I mind hearing someone moaning when I'm trying to sleep, and I'm such a light sleeper. Anyways, I will just straigthen things up with whoever I live with, we will sign a NO SEX IN THE APARTMENT CONTRACT 😀
If you're asexual, that's a perfectly legitimate (I knew someone in college who considered herself such), but you may want to try to seek a roommate who also identifies as such. That way, you are guaranteed not to have to deal with it. I have to say though, I get that you might be asexual, but I don't get your hatred of sex. To each his own, right? It's also a natural biological process that brought all of us into being. If it isn't in your face and you can't hear it, there's no reason to be so absolute.
You should probably get a studio and live alone. Odds are you are never going to find a roommate who is willing to agree to never have sex ever in the apartment even if it's in their own room because the very idea of sex happening somewhere (anywhere) nearby makes you squeamish. Get. A. Studio.