Jamaharon

From Memory Alpha, the free Star Trek reference.

The jamaharon is a sexual rite originating on the pleasure planet Risa. One's desire to participate in jamaharon is indicated by the display of a horga'hn, a small statue which is the Risian symbol for sexuality. (TNG: "Captain's Holiday")

Jamaharon with Arandis was the direct cause of the death of Curzon Dax. (DS9: "Let He Who Is Without Sin...")