Finastetide has been clinically shown to cause impotence and depression much greater than the placebo control. The warning flier in the prepackaged box states that very clearly. However, baldness can cause depression and and estrogen can cause impotence, as well. I've taken propecia, been bald and depressed, and am now on estrogen and dealing with ED.
I'd rather take the propecia, preserve hair and deal with the ED via cialis and not worry about it. So far my strategy is working fine.