If you are offended by anything sexual, this documentary is not for you. While I don't think there is anything too vivid or explicit in the movie (I did not take a microscope to check of course), there is a lot of nudity and the moaning alone might be enough to get some going I reckon.
Remember this is depicting swinger lifestyle and it also lets those who do it (no pun intended) talk and tell us what they think and how they feel. I don't know if I could do something like that - if I could be so "free", but I do know that there are a lot of people who have issues with that kind of freedom. They even judge people like the ones we see here. I am all for live and let ... well live or have fun. If you don't agree with their moral compass - ok. Don't judge or shame them though - they are more than ok with it. They are having fun, they don't hurt anyone (well unless I guess it that type of roleplay), but that is all done with acceptance and consent.
An intriguing look - that does not shy away when it gets intimate, but never gets in the way either.