"...sex fantasy that hasn't yet been immortalized", LOL. Paul Norman had a huge success for the short lived In Hand Video company with two movies with this theme back in 1989 titled "Joined" and the sequel "Separated" starring Racquel Darrian and Sabre as the conjoined twins. I recall that they even made a magazine of this movie that sold like hotcakes. These new school porn directors don't know their history!