Nobody really uses the hanky code anymore, so you have to do it with body language. That means you must think about how you stand, make eye contact, and smile. If you are top, make it obvious. Stand with presence or get your dick out, stroke it hard and show the subs what they’re in for. If you are a sub, find a fuck bench, drop your pants and bend over or lean against a wall. Make eye contact as a guy walks by. It’s the universal sign for ‘I’m interested’ or ‘on heat’. Break into a smile so he knows you have noticed him.
The other universal sign of interest is a very gentle touch to the ass or nipples. Keep it unoffensive. Often you won’t get a response, but don’t worry – everyone gets many rejections. George Michael once spent two hours in a darkroom without any action. The guy who passes you by may have just cum and be heading out, or maybe he’s into another tribe. Play spaces are a rainbow of interests – there will be someone who shares yours.