A lawyer convinces his reluctant wife to go to a [real life] nightclub in Hollywood called Filthy McNasty's where they shall meet swingers and have sex with other people. Anyone with a brain will know this is going to go poorly for the husband and the reluctant wife is going to find out she loves having a train run on her. The husband puts an end to his wife's sexual escapades in a very deadly fashion.
This would almost sound like an interesting premise besides the fact it's a fairly boring film with more softcore sex than anything of interest to me. The people were always so sweaty too, it really grossed me out.
I wouldn't suggest this film so much if you're into horror movies but if you have an affinity for vintage porn you may find something interesting here, besides the alternate title (and theme-song) of "Inside Amy."