Romance in BGII:EE

I'd really be interested in knowing about how to activate the multi-romance options in BGII:EE ... I'm returning to my beloved game after a 10 year absence and everything is new to me! But I don't want to have to play multiple characters just to see how the romances develop.

Is there a romance available for Hexxat?
Or Neera?
Or a way to romance 2 or more of the NPCs without ruining it for one of them?