There is a shortage of slings in most darkrooms due to space. They are for guys who want some serious wrist-riding action. Jump into one when you have found a top willing to do a full cavity search of both your outer and inner rings. Don’t lie there all night as if you are on a beach with a good book. This is the most common complaint about sex players in venues. If you have no action after five minutes in the sling, get out and move on. If two guys ask if they can use it, get up. You haven’t paid to hire it, and the organisers certainly did not erect it exclusively for your use.