I'd tell her about your concerns, and let her deecide. If she still really wants to give it a try, you need to decide if you are OK with that. I think BigBear is right -- you may need to know if she prefers women to you. Bad thing to find out after you've bought a home and have kids together.

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Life is too short not to love and be loved....preferably multiple times in one night.

I think men talk to women so they can sleep with them and women sleep with men so they can talk to them. ~ Jay McInerney