Sometimes, even if you have a regular and active sex life, it is a lot of fun to talk dirty to your partner over the phone. Whether you talk about what you did last night, what you want to do to her this weekend (or what you want her to do to you) or whether you just weave a fantasy, talking on the phone has an entirely different sexual dynamic than talking in person. If you or your girlfriend is shy, you also might find it easier to find your sexual tongue on the phone than face to face. Even people who live together find talking about sex on the phone feels totally different than talking together in person.