Girl: Sure, but what are the benefits?
Guy: Hugging, kissing, holding hands.
Girl: No sex?
Girl: Okay sure then.
Thats an example of becoming friends with benefits. You can choose the benefits you want! It doesn't mean you have to have sex or oral or anything, as long as you decide the benefits you want and you both agree on it, then its official.
2. A physically involved relationship, where both partners enjoy some comforts of sitting on the fence between serious relationship and simple friendship.
3. Any realtionship that can only be catagorized as being between Friends and Partners, also refered to as More then friends