Chain Link Fence
A new sex position requiring at least three people. But can have as many as you want. The man lies on the floor while a girl is on top of him. Then another guy does the girl from behind. But the fence can go on as long as you have people who want to do it.
Whenever you get bored and have three or more people, do the Chain link fence. It's fun and healthy. But make sure you wear a condom.