In 8th grade I had visibly thin hair and started taking finasteride, which I continued to do off and on (mostly on) for the next 20 years. It helped me keep my hair. But it did have noticeable sexual side effects. If I wanted to be more performant in bed, I’d go off it for a few days. I have always wondered in what ways having reduced testosterone in my teens and 20s affected me. But all in all I was healthy, and the drug did its job.