Friend With Benefits Meaning

(idiomatic, slang) A friend with whom one has a casual sexual relationship.

Example: 2003, Alexander Hart, Time in Question
  â€œI’m just saying that usually when you have a friend who’s a girl, it’s not just that she’s your friend. Either you’ve known her a long time, or she’s a friend with benefits.
2003, William Marsiglio, Making Males Mindful of Their Sexual and Procreative Identities: Using Self-Narratives in Field Settings, in Perspectives on Sexual and Reproductive Health, Vol. 35, No. 5
  Gender norms influence how young men orient themselves to sexual partners and girlfriends, and men’s procreative consciousness is sometimes affected by how they define a potential or actual sex partner (e.g., casual or serious girlfriend, “friend with benefits,” hookup).
2004, Cynthia Henry, Discovering Normal
  â€œCan I be so bold as to ask if I can be a friend with benefits?”
2005, Jennifer Klein, University of Pennsylvania
  The College Relationship is the hook up that turns into a “a person to hang out with,” more or less, a friend with benefits. This is a person whose company you sincerely enjoy, and you choose to spend extra time both hanging out and hooking up with, but there is no spoken commitment involved.