Sure rape doesn't have to be the main issue to count. I guess what I was trying to say is that I just wouldn't classify it as rape. I also wouldn't classify it as rape if someone had a relationship/sex while undercover for example (which for example can happen with long term undercover law enforcement). Or if someone lied/fabricated evidence/etc. to keep a relationship going, that would otherwise have ended. Both of these thing are of course severely fucked up, but I wouldn't really call them rape.

I feel like the Willow/Tara situation is more in line with these, than with putting someone in danger via undisclosed STD or the pretend doctor. At the end of the day it's really hard to put real life terms on magic anyways so maybe, its a moot point to argue.