Hmm, my guess is this zombie would have other intentions and would be struggeling as a result, so I'd have to subdue her in some way, and then while she is still strugeling have sex with her...
Sounds an aweful lot like rape to me, and would very much feel like it to me, so no thanks, I'll pick up some live woman when the apocalypse comes if I had any needs. Bigger things to worry about at that time, seems to me.