noun: A go to is the person you go to for sex on a consistent basis without it being a dating relationship. It is also the term to use when describing the fact that you are sleeping with someone but not actually dating or even "seeing each other". Its the term for the person you go to for consistently good sex and no pressures.
The term perfectly describes a relationship based soley on sex. Unlike "friends with benefits" which implies friendship that includes sex, the "go to" relationship generally starts as sex first. If a friendship develops it is usually a by-product of the sexual relationship rather than the origination of the sexual relationship. Different than a booty call or hook up, the go-to relationship is generally more consistent, which eliminates one or both parties from having to go out and look for it.... Cuz ya got a "go-to" for that!
Question: Are you dating anyone? Answer: No, but I do have a go to.
Question: What are you up to? Answer: My go-to is coming over for a bit then I'm going to the mall.
Question: Wow, he's cute...are you dating him? Answer: No, he's my go-to.