No single men allowed: Important etiquette for attending a swingers party

Although not a swinger myself –and if I were, I wouldn’t tell you – I have been to such gatherings in a non-participatory capacity for work (no, not that kind of work) and duly reported back.
So when I read the other day that single men could attend this swinger Halloween do in Cork for €15, it sort of made me shudder.