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If a PC has carnal relations with an undead, is it necrophelia?

So I have a group of six lvl 6 PCs, two of which are Druids: Maximillion Testicles and Kalea. Max prefers to wild shape into an eagle. This last session Kalea posed the question: "Could Max crap in the eyes of a monster to blind them?"
I like to allow creativity in my game. I try to be very flexible in adapting rules to fit situations the creators may have overlooked. My question is: have any other GMs run into this question and if so what was your adjudication?