I think it's a vampire movie, where visitors to an old house have to stay for a certain amount of time to inherit the house or something. There's a scene where 2 women in bed are making out and then a young blond guy gets into bed with them and one woman has it off with the guy with old fashioned music playing on a phonograph. I think it's from around the 80s or 90s.

I found it. It's Blood For Dracula (1974). Not quite the way I remembered it, but it's the one.