Ok My girlfriend and I were talking today and we wanted to watch an old movie that was either on skinemax or HBO after dark we aren't sure but we know it was on one of the cable movie channels after dark... the plot is that some scientist is trying to make an aphrodisiac or something along those lines, he goes to an old girlfriend and she gives him a formula he tries it and drinks some coffee afterwords and that somehow manages to turn him into a her... she starts having sex obviously and then he/she is trying to go about daily life, but every time he gets horny he transforms into a she until orgasm... we pretty much know a lot of the details except the name of the movie... can anyone help us out?

Possibly Sexual Chemistry

Yes that's it thank you very much!!