Girlfriend Experience

A few days ago, Above the Law posted this ad from Craigslist by some law student from Miami who was also a hooker who was going to be in town for a few days, and was advertising "G//F//E." Since I'm not a prostitute (yet), I googled GFE and discovered that it stands for "Girlfriend Experience." According to Wikipedia, the Girlfriend Experience is a type of service offered by a female prostitute which includes acting like a girlfriend to the client. Um, why anybody would want to PAY to be nagged, annoyed, yelled at and threatened with ultimatums is beyond me, but apparently what separates a hooker from a GFE hooker is that the GFE hooker provides "french kissing and deep french kissing (DFK)."

Alrighty - can someone please explain to me what the hell's the difference between french kissing and deep french kissing? What even IS deep french kissing? Is it like when you have an emotional connection to someone like Bret Michaels does with Taya on Rock of Love Bus, and then you kiss them? I've polled a few people and I'm pretty convinced that Wikipedia made up that term because everyone I spoke to only knew about frenching, but then called me a loser for calling it frenching, which is annoying because I was just trying to use the technical term.