There are many swinger couples but about this couple I think that they are not doing things right:
Normally for what I have researched, swingers share the bed all together, so this can be a "shared" experience for the couple. This, for some couples, can evem make the relationship stronger. They did that thing of sharing all together the bed one time.
But what happened yesterday I think is not good for the couple.. they were fucking other people in different rooms, so that is really cuckolding each other and not sharing this as a experience to make them stronger. Also I did not have access to the bedroom, but before the girl Masha had sex with the guest, she was flirting a lot with the guest guy but in a way as if she was almost in love with him.. Sasha looked to the floor drinking and being very passive while that happened... then for what I have read Masha fucked the guy like crazy!!
Another rule and an important rule for swingers is to use condoms when they fuck other people.. that is a way of respecting each other... they were not using condoms at all... Masha got all the the sperm and the same the other girl guest that fucked with Sasha
I do not think that they will last long as a relationship if the do not do things with respect... soon things can get out of control.. specially for Masha which I do not think that can control her feelings and falls in love quickly.. also I think she might be some nymphomaniac of some kind... :-D