Rusty Crustacean

The Rusty Crustacean is a sexual act where; a female lays on her back and her partner puts their thumb inside the vagina and four remaining fingers inside the anus of the female. Then, the partner squeezes their fingers together (reenacting the movement a crustacean's claws make when closing) causing fluctuation of the vaginal and anal region of the female. Maximum pleasure is promised if performed correctly.

Dude, I totally gave Candice the ol' Rusty Crustacean last night... She loved it.