Years ago, we used normal games and changed things to accommodate the sexual nature. No extra money spent.
This
However depends on setting and event....a lot of the meet ups I've been too have been smaller informal groups....like 2 to 4 couples.....you get there and spend a ton of time being shy.....everyone knows what they came for....yet there is a lot of apprehension ......lots of awkward small talk...."so you sell insurance....that's nice"
I found twister to be a great starter......you can start clothed....maybe get more risky as the night goes on.....add a rule here....subtract something there
However this won't work in like a huge setting....or if your like older or heavier.....I guessing it's no fun to play twister on with your surgical repaired shoulder