I've been suffering a gradual thinning since age 18. I am now 30 and the hair loss is beginning to be more noticable. I recently started taking propecia - but only for 7 days. During that short period of time I developed a dull pain in my testicals (primarily in the left testical) as well as a decrease in sexual interest (which I've NEVER had before). As well, I routinely lift weights and I believe I am very in-tune with my body. About 3 days into taking the drug, I felt that my workouts were less effective. I felt I was working out just as hard, but I wasn't getting the "burn" that I used to. DHT while bad for hair does play an important role in muscle development. So while it may be okay for a soft-bodied, desk-jocky, it's wasn't exactly okay for me. Of course, one could argue that I quit too soon. However, it presented a risk that I was not willing to take - especially since I would like to have kids someday. I'm not vain enough to threaten that and I've studied enough to know that extended use of hormones can really rearrange your system. Regardless, the sexual desire is alive and well today (I quit about a week ago). For now, I'm starting up Rogaine 5% - which will hopefully maintain what I have until a "safer" treatment is available. I've been on it about a week and I believe I'm beginning to experience some shedding (more hairs on the pillow than before). I'm willing to wait it out and see what happens. At the end of the day I'll take bald and hard over a limp noodle and a weak body. Think about this guys, so what if you have a great head of hair and a "hot chick" if you can't get laid! I know a lot of balding guys with good looking women. Shave it short and hit the gym! I haven't met a woman yet who doesn't like a strong chest, ripped arms and a six-pack (shaved head or not).