My Boyfriend recently told me that he is a crossdresser

[sandra-leigh]

Fine, pretend you don't know what in the world I could possibly be talking about.

I really have no idea what does or does not "go against YOUR nature", let alone Sara's (and, please, no TMI!). But if you want to generalize about sexual roles or whether specific sexual acts are "within the nature" of women, then I suggest you first visit your local "alternative lifestyle" coordinating committee or club and see who is initiating what.