A friend with which you occasionaly engage in sexual activity ranging from mutual masterbation to oral sex to intercourse. A true "FTF" relationship seldom. A friends with benefits will ask you how your day was, a f*ck buddy will ask you how the sex was. A friends with benefits will make plans to hook up later in the. Here's an adult guide for people who want to have sex with a friend and to do the deed, click here to continue reading about how to become a fuck buddy.