This is when a man gets in a bathtub with a woman, where both take a shit (diarrhea preferred) in the tub. They proceed to have sexual intercourse in the water amongst the low viscus excretion. After the dead is done, both take turns sipping the bath water with a straw.

One partner urinates into the other's bellybutton. The urine pools up in the bellybutton and creates a warm pool (Hot Tub).

When you're in a regular pool and everyone farts underwater to produce their own bubbles.

1.when one wears swim trunks or bikini outside.

2.wearing swim trunks around town and imagining being in a hot tub

When a person or group of people line the bed of a pickup truck with a tarp, fill it with water, and relax in it.

Due to the high temperatures found in hot tubs normal sperm can not survive. Therefore if any sperm do survive they're pretty freakish and abnormal. Any pregnancy resulting from use of these sperm results in a hot tub baby

A fat thick meat gina.

A wide, meaty vagina.