An embarrassing moment story illustrated this one based by "Hot Spot" Traumarama! from April 2011 issue of Seventeen Magazine. So girl is at a pool party, doesn't want to get out of the pool to use the bathroom, so she doesn't. Boy she's crushing on swims over and notices the warm spot, boy proceeds to shout out to all attending the party that he is staying in that area of the pool because it's warm.
Or if you don't like that story, it's just a nice summer pool party illustration.