Keeten Planx was a male Trill joined to the symbiont Planx in the 24th century. He was physically fit and a strong swimmer. Like other joined trill, he was free of the mental and emotional confines of gender.
In 2371, Planx had a sexual encounter with Burgoyne 172 while s/he was on shore leave on Argelius II. Having arrived at the resort a few days after Burgoyne, Planx met hir and was subject to Burgoyne's admiration. Their encounter in Burgoyne's private pool allowed the Hermat to appreciate Planx's athletic grace and spectacular abs - once he'd removed his vest and kilt. (NF - No Limits short story: "Through the Looking Glass")