Sabine is predominantly heterosexual and heteroromantic, but because her powers are empathic at base, and she's not a Kinsey 0, she's perfectly happy to sleep with a woman who appeals to her for other reasons.

Her Sanctuary hitlist:
* Scott, because she's wanted him sense she met him and if she gets her way, she will have him.
* Will, because they've hit it off so well, and he's intelligent, interesting, compassionate. All qualities that matter to her.
* Molly, with or without Will, because she's gorgeous and looks like one of her best friends, who she'd also sleep with with or without her boyfriend, plus it may take some time, but they get each other.
* Porthos du Vallon, because she's discovered she very much likes him and he's a big strong guy. She has a weakness for the type.
* Nick Gautier, because he's cute and snarky, and she's pretty sure it would be a lot of fun.
* Jack Harkness, because she has a pulse and so does he
* and I'd guess Bucky, Steve and Leonard from the reserve list

Really, if it's a guy who likes women, there's a decent chance. When she's not in a relationship, Sabine's very willing to engage in sexytiemz.