love orgy

plural love orgies

1. An occasion on which people engage in group sex.

   [B]ut it was only to postpone her coming till the next day, for a planned “love-orgy” at the hut.

   1959, Loran Hurnscot, A Prison, A Paradise, New York: Viking Press, page 55

   1 more example

   Bathing in the river followed, culminating in love orgies, the preceding formalities being in a sense introductory stimulants.

   1961, Harry E. Wedeck, Dictionary of Aphrodisiacs, New York: The Citadel Press, page 140