Dr. Suporn's method differs from most MTF SRS in that he does not use the penile inversion method. He instead constructs the vaginal canal with scrotal skin and uses the penile tissues for the labia, clitoris, and other external features. A full thickness inguinal (groin crease) skin graft is used for the vaginal lining in cases where inadequate scrotal skin is available. Dr. Suporn's method generally yields a deeper neovagina than the more standard penile inversion technique[verification needed] and positions the areas of greatest sensitivity at the same locations as on genetic women. Suporn's form of vaginoplasty has been referred to as the Suporn technique. Dr. Suporn always retains the Cowper's gland or bulbourethral gland. In non-genetic females this bulbourethral gland is responsible for the thin, colourless lubricating fluid that is secreted during sexual arousal, which also adds to the natural lubrication.