Sit on the second-to-last stair in the shallow end of the pool with your legs spread. Lean back on your forearms for support. Have your man stand between your legs with his arms on either side of you as he enters you. He can lean on his hands for leverage as he thrusts wildly.

Your man's vigorous in-and-out movements will create carnal currents that will hit your nether regions, boosting stimulation.