i definitely have no problem with it, as majority of my characters have varying sexualities such as asexuality, heterosexuality, homosexuality, pansexuality, transsexuality, etc. a few of my characters have crushes/mates in character, as well, and i would never mind anyone listing one of my characters as a crush or attempting to flirt with them - so long as they ask for permission beforehand, haha.
i also play around with different gender identities! most players, i've noticed, don't really pay attention to this or simply don't 'believe' in gender identities. a lot of my characters are actually gender neutral/transgender depending on who the character is.
personally, i really do frown upon those who believe characters in the game should not be anything other than heterosexual, as animals in the real world all across the various species often partake in sexual behaviors that are far from heterosexual. c: