Theoretical Testicles
The balls that women freeze off when they climb into cold waters. Women don't have testicles so we need something to freeze off besides our breasts because that would be saddening for both sexes. The moment when you get your groin area submerged into the water and you must stop and breath those are your theoretical testicles falling off.
When she cannon balled into the water, you could see her theoretical testicles shrivle and fall off.