ride the rapids

During sex of an intense nature, there are superfluous fluids, inducing splashback; it feels like you've been hit in the head with a paddle.

Sue hopes to be able to ride the rapids when she gets home tonight.

riding the rapids

When a woman ejaculates while you're fucking her in the pussy, you neither pull out nor let her squirm away but ram your cock in deeper to make her squirt harder.

"I hit it so good that I was riding the rapids after only five minutes of beating up them guts."