Breaststroker

[Ernesto]

People who get erotic and sexual arousal from swimming and all things to do with swimming pools, including [swimming pool] showers and changing rooms and other [swimmers]. These people may also have the same arousal from swimming at the beach.
A breaststroker may even uses such environments to cruise people for sexual encounters, when these people are doing this whilst swimming they are dog paddling.
The term comes from the sexual connotations that [arise] from the swimming term breast stroke, stroke also being an obvious euphemism for masturbation.