I don’t think that "consent" is sufficient to determine whether a sex act is ethical or not. I am unsure whether it's necessary for an act to be ethical.

I hold this belief not because I support rape, but because the arguments the consent-fixated make seem very poor to me. Consider Bardfinn's attempt to analyze incest through his philosophical framework of consent. It's tortured logic that leads him to conclude that incest is OK if you don't live in the same house... or something.

Consent has fuck all to do with whether incest is OK. That's a braindead argument to make.