Like everyone else hygiene is paramount, so bad hygiene has to top the list.
Long finger nails on a guy, seriously if they're too long the woman you're with will be climbing the walls but it will be to get away, not though the pleasure you may think your fingers are giving
.
Pushiness is never good.
Up your own arseness is a trait that would soon have us heading in the opposite direction.
Poor appearance/dress, we've made an effort we like the same in return.
This is our take on the hairy bloke thing, now we all, I think, appreciate a degree of grooming. But we can't help but laugh when there's a really hairy guy who leaves everything hairy but has a completely clean shaven groin area. Shave your cock & balls(& back & crack lol) certainly but perhaps a bit of progression with the razor & clippers would look a bit better & more organic.
Really drunk isn't a good look as a swinger, we all need some Dutch courage but not too much.
Couples that are clearly only interested the female half. Whether it's on a site, on a meet or at a club nothing can be more insulting to the male half. Whilst we may not be as pretty as the female couples generally come as couples & should be treated as such.
Can't think of anything else off the top of my head, but when I do I'll be back