Show them a video of your dog trying to climb a tree to get a squirrel. Casual sex is not the place to try things with which you don’t already have a baseline comfort level.
There’s a huge difference between, “I’ve never had sex in a car, wanna help me out?
At some point, sex becomes an issue in any new dating relationship; it's really just a question of when. Everyone seems to have an opinion, from doctors and psychologists, to parents and clergy, to friends and passersby.
You may need to navigate weird situations like what role you play at their birthday.
Part of the agreement is that This is the number one rule actually.
They may never you that they don’t want you to stay over after sex.
If they’re a friend or acquaintance, you both may have to renegotiate your friendship a bit after you’ve slept together.