My kind of consent
Consent involves one question: "Is this something you want to do?" If the person being asked cannot organically confirm, void of outside threat, it is not consensual.
The only other parameter is status. Both parities must have equal emotional status. Status manifests in dramatic age differences in which one party is adolescent, as well as emotionally unequal boss/subordinate relationships. Additionally, if one party is dangerously impaired by alcohol or drugs, then he or she is not able to grant consent.
The line blurs for me when both parties are similarly intoxicated. I'm not sure how to best communicate consent in this instance.