You know, that is a very good question. I, myself, went to the Doctor a few years ago feeling out of sorts. I took a Testosterone timed blood test. Meaning they took blood every 30 minutes for a period of time. The results of the test were that I was normal for an ovulating woman. I began treatment with the patches, but since, I have been taking two viles in the form of a shot once a month. I would suggest that if anyone thinks they may have a problem with sexual performance or just plane do not feel well to seek the advice of a professionsl. I understand that this a topic that often is joked about but it can also lead to more serious problems down the road.