If you,don't have tinder / a smart phone with apps -

[Aridane]

and are above the age of clubs, alcohol and drunken encounters,many want a NSA encounter safely (enough),'where do you go?

swingers clubs personally... well not now but in the past, theres a few in the UK which Id recommend for single women that I know are safe and very friendly.

Over 40's nights/soul nights etc, attract a nice crowd of people who want the same sort of thing. Watch out for the creepy married ones though

If you're on MN, you can get on to OLD sites like Plenty of Fish. Just specify no ties. I kind of did that, but ended up engaged to the first man I met with