Harper, a poem of this complexity & nuance can be read in multiple ways.
Truth is this actually happened, about 6–7 years ago, I changed some facts — it was winter, it was not a Ramada, and we had just one young child at the time. The amorous couple was in fact in the water by the deep end. This is what I meant by back to the water — she was holding on to the side. And yes they were going at it, with bathing suits still on.
Now — whether this is dry humping or wet humping — let’s phone a few friends. Mary, Terijo, Bebe, Jane, Clay, and for some French speakers, DiAmaya, Stephen, Gyula — I think that dry humping in a swimming pool can be labeled semi-dry humping. Or to borrow a French term of art — demi sec humping.