I know that some people who have tried this are confused because the instructions are not clear. Here are some answers to some common questions about this product and what they do. I am an MD so I can speak to that. 1) Can this work on men and women? I don't know. 2) Are there any benefits for men? A: If you are a man, it could be beneficial for you. 3) Do I get any side effects? A: The body is a complex system. If you have sex, there is no one single cause for the body's reaction to sexual stimulation. It is very unlikely that sex would make you feel less tired, even if you are feeling tired at the time. A more likely reason would be if you have been drinking. 4) I'm just a man, is that enough to buy it? A: Yes. It might sound scary, but I know from experience that men can also buy this product if they have the means. It is also important to understand that this is not a solution to the sexual problem that men have. Women can use these products without buying it. 5) So there is no good option for women? A: No, there is a good option.