Judy Farr

Merrie, a nymphomaniac, seduces every man in the family-operated boardinghouse while her younger sister Renée keeps watch. Renée soon blossoms from an awkward adolescent into a voluptuous woman who can hold her own with Merrie. The sisters join all of the boarders for a party that eventually becomes an orgy.

Not too involved as far as plot goes. Basically people in the same office having sex with each other but not a whole lot is shown.