Gateway Fuck

To have sex with a female for the sole purpose of having sex with her friend(s) in the future.

Guy 1:"Dude I totally railed Kim last week!"
Guy 2:"Why the fuck would you do that? She is a 4.5 maybe a 5 on a good day!"
Guy 1:"Yeah man but she was just a gateway fuck so I can slam with her sexy friend Olivia!"
Guy 2:"Man you are some kind of magical fuck wizard!"