A
threesome between a hetrosexual couple and a third-party, where the third-party only ever interacts with
one member of the couple who is of the same sex. Essentially giving
one person in the partnership a bisexual experience.
Named after the character Ross Geller from from the
sit-com 'Friends', when Ross proudly proclaims to Joey, that he had a threesome with his wife and her freind. However after additional discussion realises it wasn't much of a threesome at all as he didn't get to touch the other woman.