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1.
Plain pussy refers to a girl who would, or did have sex without any strings attached and no obligation to create a relationship. It also refers to the sex itself as in example 3. Plain Pussy could refer to the girl involved in a one night stand or a booty call.
1 "Those girls look like a couple of pain pussies"

2 "what do you want to do tonight?" "I want to go out and find some plain pussy"

3 "Dude! I have this friend at college and she gives me plain pussy all the time!!"
by EE number 2 August 30, 2012