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Not your girlfriend/boyfriend, but someone whom you have sex with more often than anyone else. Used in places where "booty call" is too distant, and "girl/boyfriend" is too close.

Especially helpful/appropriate if you're actively "seeing" more than one person.
Person 1 : "So.. is that your girlfriend?"
Person 2 : "Nope. She's my primary sexual provider"
by Rev. Mitcz April 02, 2007
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