So we have been thinking about threesomes, foursomes and even group sex for quite some time now. Of course we had to talk about what would be OK for each of us. This is where the problem for most couples begins - they don't or can't talk to each other about what they really want or might want to try.
Fortunately, Candy and I did talk about every possible thing - from touching to penetrating. Of course it takes some time to even just think about the fact that your partner puts his thing into another woman - or - that you girl is getting banged by some other guy. Think about it - isn't that the exact thing WHY you want to do it?
If, as a couple, you do swinging or 3/4 somes you should never do it to have sex with another person "legally". If this is the case - break up and enjoy your sex drive.
So you made the decision that you want to share you sex life with others in some way - make sure that you play through every possible situation that could happen when all three or four are naked in one bed.
I can only ...