there's a scene in seinfeld in which jerry and elaine (former lovers, now just good pals) decide on rules for hooking-up... "staying the night is OPTIONAL!"

There's a film called Two Night Stand that basically revolves around this.

I like this topic, it's rare to see characters discussing and consenting to having sex before they do as consent is so often never clearly stated in media representations and simply just implied.

That said I always remember how wholesome the stoner parody Munchies (1987) was for this exact reason.

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The Pick Up Artist , from 1987, has Robert Downey Jr trying to get with the witty and irresistible Molly Ringwald, but first he has to rescue her wayward father, expertly portrayed by a recently rehabilitated Dennis Hopper, from organized crime gangsters. It's romantic, funny, and heart warming. If you ever want to Netflix and chill with someone special, you can watch this movie with them, and they will be so relieved to not have to rescue their father from gangsters, that they will feel all warm in their heart, romantic, and then they will love you. Unlike that awful film, Indecent Proposal , From 1993, featuring the dashing Robert Redford as a horny zillionaire in the make in Las Vegas, the "City of Sin", of which they all say, "what happens in Vegas stays in Vegas", and that's all, so who cares what you do? So when the sultry and desperate Demi Moore catches his fancy, he's got a million dollars just to hook up with her no strings attached, no holes barred, night of hooking up with each other in every imaginable way. He really wanted to get his million dollars worth out of her. She's married to Woody Harrelson, though, which complicated the indecent proposal. Woody's only interested in talking about Rampart (2011). The rules to hook up in that movie are, you have the right to remain silent, anything you say will be used against you in a court of law. Put your hands behind your back, and then they put handcuffs on, now Robert Redford doesn't seem so indecent after all, no?. What would you be willing to do for a million dollars? Remember, what happens in Vegas stays in Vegas. You can get a million dollars if you are willing to agree to the rules that you hook up every way imaginable, but just because nobody knows what happened, doesn't mean that you won't feel sore in certain areas, or have other unwanted consequences. You just can't ever talk about it. That's the rule, because it's indecent.

I liked the future of dating in the scifi movie Cherry 2000(1987) where in a nightclub, lawyers have to be witness to agreements to a one-night stand.