I've gotta agree with OT here, CTH. Aside from the morality of it, which she has covered, there's a practical reality as well. When you start banging somebody it brings in another complication and especially if you haven't been clear about what's going on. If you're both OK with it being a fun time, no attachments, no expectations then fine...I guess. But, if both parties aren't clear on what is happening here you're asking for problems. If she sees sex as commitment and you don't, it's an issue you don't need at this point.
