The penetrating partner seats him or herself (with strap-on penis) on spa/pool step, so that lower back is arched yet firm. The receiving partner then slowly sits herself or himself onto the penis/strap-on of the penetrating partner. The receiving partner then swivels in the water with the penetrating partner's penis/strap-on still deep inside her or his anus; using the spa/pool water to aid in anal lubrication and cooling. The penetrator then slides off the step to thrust the anal probe deep into his/her parters ass, while the receiving parter treads water and masturbates.