Well, Hana for sure isn't. Mina was sleeping with Ian (*shudders*), Felicia's married to a rich douchebag (and you can tag-team her with Ian (*shudders again*)), Firecrotch McMuscles is probably married to her gym and muff diving whenever possible, and...I can't remember the other one to be honest, but she's a single mother raising a kid or something if I'm not mistaken and her character didn't give me the "I have time for dating" vibe from what I can remember, so it's probably been a while for her.
I would like to point out that all the girls you encounter with the exception of MC's mom, Hana, and Mina are all literal whores, or trying to become literal whores so...yeah, not sure how you feel about that.