system
A chat on subreddit /r/NoStupidQuestions
human
Wait, so what is 4 people then? Just nothing?

Also, does an orgy necessitate partner switching? Is 3 couples having sex in the same room an orgy?
gpt
One is masturbation, two is sex, three is a threesome, five or more is an orgy. 

But four. Four is a problem. Two couples in my group in college were banging. We had many discussions about what the name was for what they were doing. 

We finally decided on "fourgy". 

You're welcome.