A bag
A bag is a person (usually female) with an amazing body, fit, voluptuous if I may, but the face looks like a potato: anything bellow the neck is a no no.
Therefor when proceeding to have sexual intercourse, you put a bag over the persons face to shield your eyes from it,
Any type of bag is fine as long as its thick and breathable!
person 1: "OMG that girl has a nice body"
person 2: "waw your right let me call her so she can turn around!"
**calls her and she turns around**
both of them: "LORD HAVE MERCY SHES A BAG!!"