Confluence 

We lie down on the longer, undivided part of the object. Confluents, naturally of the opposite sex, are placed on opposite sides. To make things easier, it would be better if all participants take off their clothing before assuming position. At this moment, by gesturing or, if needed, communicating verbally, we invite one of the people lying opposite. With a simple shift forward along the upholstery, we transport our bodies to the midsection of the article, where we and the selected partner have confluence. As only the midsection is strictly reserved for confluence, after finishing we return to the starting position. We may repeat the entire cycle as long as our energy holds up. The surface is easy to wash. We only use inorganic detergents.