The "girlfriend experience" generally involves more personal interaction than a traditional call girl or escort offers. There is a focus on not just completing a sexual act, but also having more of an experience. Often sessions last longer and are "no rush," which means the call girl spends the full advertised time rather than rushing out after a climax. Common activities usually offered by GFE escorts include kissing and/or french kissing, cuddling and foreplay. By contrast, non-GFE prostitutes typically refrain from kissing because they consider it more emotionally intimate than sexual intercourse without kissing. A call girl advertising the provision of a "girlfriend experience" is implying that she provides deep french kissing (DFK), "full service" (intercourse) usually with protection, and fellatio and cunnilingus, both with or without protection. Advertising a "girlfriend experience" is sometimes used by call girls to promote business.
"Girlfriend vs Porn Star experience"
Another familiar word in call girl slang is girlfriend experience, abbreviated GFE, that normally implies an escort will have a warm personality, be generally affectionate and be willing to kiss the client. This contrasts with a PSE (Porn Star Experience) which implies an encounter that is more lascivious and adventurous than affectionate and will typically include activities common to pornography such as anal sex.
All definitons were sourced from http://en.wikipedia.org