Oh my goodness that is so very naughty! I did something sort of similar. On vaca in Fla, no one in the condo pool (unfortunately) the pool jets were placed perfectly just below the water line, floating on my back, swim trunks off, cock hard and facing up, bent knees to get closer to the wall water jet, omg, what an amazing hands-free ejaculation that was. Wish I could have had some company to take part.