This is an old favorite, and it is very useful if you and your lover have to be apart. Of course, since getting off with your girl on the phone is a really fun and dirty way to play, you don't have to actually be too far apart; separate rooms will suffice. Our aural senses are very sensitive to erotic sounds; as a result, panting, heavy breathing and moans trigger a heightened sexual response. Phone sex also allows a bit more freedom because you are alone and can therefore do as you please as far as masturbation goes. Physically, the pressure is off since she is responsible for herself and you for yourself. The topics you choose to discuss are up to you, but unless she starts it, stay away from anything involving family members, animals (don't even go there) and other women that you fantasize about.