Consenting to one behavior does not obligate you to consent to any other behaviors.
Consenting on one occasion also does not obligate you to consent on any other occasion.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
The issue of consensual sex is often only brought up when there is some sort of doubt about whether both people engaging in sex want it to happen.
She claimed it was rape, he claimed it was consensual, and a jury acquitted him of the charges.