In The Last of Sheila (1973), he plays a failed screenwriter invited, along with other tarnished souls, onto a yacht for a "murder mystery game." And the stinger-- one of them might be gay! Actually, most of them have gay "skeletons in the closet" to reveal as the game turns deadly.
Add his total lack of self-consciousness about appearing nude, and you get a pleasantly positive star for gay boys of the Boomer generation. In spite of the girls hanging around.