Starfish(n) the anus, or rectum. Also an adj.

A girl that has no talent or technique for sex. That is, she just lays there spreed out dead in the water, like a starfish.

Noun: A dead fuck. Someone who may lays there, doing nothing, during sex.

When an individual is too intoxicated or tired to participate in intercourse with their partner they simply lay on their back outstretched to resemble the same shape as a starfish and let their partner do all the work.

When you get so high you are spread out and stuck to your bed like a starfish.

Women that lay still, almost lifeless, with arms and legs spread during missionary sex.