Cue nightmare flashbacks of Dorm rooms & bunk-beds, especially when you have a Midterm the next day
This sounds like what my 2 cats do. He’s about 8, she’s 4, both are fixed. Sometimes they act like they’re best buds, sometimes she’s obviously just tolerating him, sometimes she does NOT want to be bothered.
Fortunately, the male cat and our pug like to rassle and chase each other around, so my fluffly little girl kitteh can relax in peace as she prefers.
My kitties French kiss sometimes. I have a neutered male and female and I’ve caught them at it multiple times. No sex though. At least not that I’ve noticed.
If he does, it’s after I fall asleep, and only the cats know.