There's something extremely important happening in feminist re-thinkings of the nature of sexual consent. Namely: the idea that there is something seriously wrong with the language of "consent"; that this language embodies a certain model of sexual interaction that is itself part of the problem. The locus of this work is the book "Yes Means Yes!" and an associated blog. There's no way I can spell out all the ideas here. The rough idea is that there is something oppositional about the language of consent and the "commodity model" of sex that underlies it. Person A has something person B wants, and so B asks A's permission to take or borrow or use it. When you see sex that way, you are just asking for people to take or borrow or use when A doesn't give permission.
So, the suggestion is, we should instead see sex as collaboration. The key advantage to thinking this way is that it now follows immediately that rape isn't sex. Period. You can't force someone to collaborate with you.
Sex educator Karen K. B. Chan has produced a (non-explicit) video that promotes this way of thinking about sex. It is absolutely fantastic stuff. Everyone should see this.