The issue of consensual sex typically comes up only when there’s doubt about whether both people engaging in sex want it to happen. However, consent should be discussed whenever you’re thinking about a possible sexual encounter.
In fact, consent should be the basis for every sexual encounter. Engaging in a sexual act without the other person’s consent is considered sexual assault or rape.
Every act requires consent. Even if you’ve been kissing, that doesn’t mean you can’t say “no” to anything further.