I think that option shows only if you're not homosexual (I started as bi but since there are more males than females I always forget to drink bi potion), I guess I'll keep that in mind my next playthrough. XD
Yes, but some time it's usefull to let them change, for example I've discovered that if you are homosexual while having sex with Arion and Vicoria you can have 2 likes more or if you are versatile while peeking through the gloryhole you can masturbate with a man.
