I'm not sure my friend would ever admit such things to a doctor either. I only know about it because I've known him well for a long time.

As for the use of other rubrics such as masturbation, excessive desire and monomania, while these may be somewhat accurate they're not as specific as "sexual perversions," especially since he has little desire for normal coition. Murphy lists only four remedies for MALE, Sexual, desire, perverted, and Phatak lists the same four remedies. While we find such symptoms as masturbation and nymphomania frequently in the materia medicas, only a few remedies show "perverted sexual desire." And that is the best description for this symptom.