My occasional request is for the provider to wear a Speedo, or Speedo like bathing suit. I have a Speedo fetish stemming from an "incident" when I was around 7 years old. My swim instructor at our local pool, who was probably 17 or 18 years old, was sitting on the edge of the pool in his speedo and his balls popped out. I can still see it to this day. I liked what I saw!