There was a movie that was on showtime or HBO or something like that. It would have been either in 1995, 1996, or 1997...

It was something to the effect of a thriller/suspense movie. All I can remember is that there was a guy that had a girlfriend but was being seduced by another woman. He had sex with this other girl on a sail boat I believe and at the end of the movie the guy smashes this girl through a window. The other girl wanted to have the guy all to himself and probably wanted to kill his girlfriend. (It's not a porno, I just only remember the boat sex part cause I was 13 and was up late with a buddy watching it, haha)

That's really all I can remember. I'd be surprised if anyone even knew what I was talking about cause it probably wasn't that great of a movie.

Anyway my buddy is getting married now and I want to get him this movie cause it'd be worth a laugh.

Any hints or ideas to what I'm talking about would be greatly appreciated.

Only thing I can think of that's close is a movie called Dead Calm but it only has the 1 woman in it which was nicole kidman.

Could be the one ?

Or could be that movie with Glenn Close and Michael Douglas.