Similar experiences here at the Luton Greenhouse Sauna. So many guys 'come for a look' and then disappear. I think that sauna is a bit too vanilla and most of the action goes on in private. The sling at SOP has a much higher success rate - it helps if you engage someone before going to the sling so they come and play. Then others seem to join in... If you just go to the sling alone and lay there, it seems to never happen. Also I wonder if the sling being in a well lit area isn't helpful - certainly the ones at Luton Greenhouse are in a room that's lit enough to see and I struggle with them. The sling in the basement of Darlaston Greenhouse is in pitch black (no blindfold needed) and seems a lot more successful. I also find not just laying there but massaging my hole and wiggling suggestively helps. Making the chains jangle also attracts attention if it's quiet.