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An expression which refers to a girl lowering her vulva onto a male partner's penis or his face/tongue.

Derived from the supposed resemblance of the delicate inner labia to fine curtains.

A particularly erotic sight for a partner, demonstrating a substantial lack of inhibition.
"Katie 's an amazing girl in the sack - I was just drifting off in the tent last night when Katie crouched over me and I watched her lower the curtains. Just then the one of the lions roared and she screamed and I think she broke wind as she jumped off."
by Katie4eyes April 20, 2018
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