need hlp to remeber a softcore erotic movie of 80s

It was a B movie and as far as I remember it had some nude in it but softcore erotic. It was in the 80s or early 90s.
It had to do with 4-5 friend couples who decided (cant rememmber why) to randomly swap partners for a full night during a party or something. In order to do that they mixed the boys car keys in a bowl and each girl picked up randomly one of them.
After doing that the relation between couples changed dramatically in many different ways. Some liked new partners some didnt and a crises starts between couples.
Thats all I remember. Definitely a B movie with unknown actors and softcore erotic
Ty all in advance

I'm sure the concept of a "key party" is found in more than one movie. Search for that term in movies and maybe you'll recognize an image on google. The only movie I recall with a key party, was The Ice Storm (1997), though, I wouldn't call that a B-movie.

http://www.rogerebert.com/reviews/the-ice-storm-1997

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I know that movie and yes its not that one. Unfortunately searching like that i found nothing and i am getting results more related to pornography than a softcore movie of 80s. Ty vm for your effort to hlp. Probably the title has nothing to do with the story, something completely random like "dangerous games" or even worst "The youth" or something.