Backdoor LettersErotic Letters from couples come to life...you'll never believe how kinky things can get back there in Backdoor Letters. Lea is inexperienced sexually and wants to explore her deepest fantasies. This week's obsession...anal sex. A stranger seduces Marica with his smile and his charm, but all Marica wants to do is get in his pants. What's better than two girls playing doctor? Well, Teacher and Student of course.