As I mentioned in my bio we were involved in swinging "the lifestyle" for years. We've faded out of it but still keep some great friendships and every once in a while fall into a situation. See my story Blow jobs can be boring.
We actually started before we married. The lifestyle is not what people think. It's not just fucking other people. There are a whole spectrum of behaviors and venues for people in the lifestyle.
For venues there are off premises clubs, or parties, on premise clubs or parties, and private get togethers. Off premise is usually a dance or party in a hotel or meet at a club where no sex is allowed. On premise means there are rooms to go have sex in.
There are people who participate at different levels. You will see couples that do only same room sex or girl on girl action, some do combinations of things. Everyone does what they feel comfortable with. No means No. Something that may turn 1 person on, is not always right for someone else. Everyone sets their own limits. Some of the behaviors we've seen are:
Same room sex
Soft swap, (we define as just oral)
Girl on girl only
Full swap. Same room, or different rooms.
FMF
MFM
Men who like to watch their women
Women who like to watch their men.
Multiple men, one girl.
Men or women who like their wives dating.
Multiple couples in one room, all swapping back and forth.
We never saw bi male contact.
When we started off we would go to off premises parties. The fun was you could dress and act as sexy as you wanted. We would go home by ourselves and have great sex. The best part is there was no judgement, for the most part, on your participation level.
In looks we were middle of the road. Eventually parties seem to cater to different groups. Hot young things, middle of the road, BBW/BBM. You find the group you are comfortable with.