I'm having issues with the "Talk About Sex" option not appearing when in the BFF's dorm. The first two times I visited, they did the "wet dream" talk and then the "you're not a virgin talk." But since then (months into the game), the option has never appeared again. The roommate is not in the room.
I've had both the all-nighter event and the quad party milkshake event with the BFF, so I should be able to move past the friend-only stage. But without the "Talk About Sex" option, I can't get the relationship to set right. I'm not sure if there's a bug in an event that didn't set a flag or what, but I'm stuck.
Edit: Forgot there's a hidden minor exhibition skillcheck for that option to appear. Leaving my post up in case it helps any others.