Reduced testosterone and DHT is not good for a young male it affects not only his ability to have a bonner but his confidence and physical state.
First of all you have a serious inexactity here, in fact, finasteride raises testosterone, because, you know, DHT is formed from T, so less DHT=more T.
T is the main male hormone, DHT is just a more potent T, important mainly in puberty. After complete body development at, let's say, 20 something years, it grows thick hair on your chest and destroys the hair on the scalp.
Other than that, no, finasteride does not make you unable to have a boner. IT doesn't even block all DHT, only 60-70% of it.
Anyway, it's a matter of choice, what you want much: to have sex with ****loads of girls, or have an acceptable head of hair.
For me personally, i'd choose the second option anytime. It doesn;t mean i don;t enjoy sex, it's just that it's not the main thing in my life, (anyway i think it's greatly overestimated, there is too much obsession with sex nowdays). Ok, it's a biological need, but to make the main goal of your youth to screw as many girls and make that some kind of trophy, that really is not my type.
OF course i wouldn't like to take a drug that would make me impotent, but if it only reduces my sex drive and keeps the hair on my head, that's an acceptable compromise.
And i doubt that none in 40 girls wouldn't have a problem with a NW4, but anyway, why would only girls opinions matter?
If hairloss affects me to the point that i no more want to look in the mirror, or i'm disgusted from what i see, that is bad, even if there's a full harem out there who would accept to have sex with me and wouldn't be bothered by my baldness.
And as a final conclusion, if finasteride just lowers my libido so that i can still enjoy sex, but allowing me to focus on other important aspects in life than wanting to screw any girl i see, that is ok for me. What could be wrong?
And all medicines have very rare , but nasty sides. Of course it's very important to be informed of all possible sides. But that doesn't mean you must be that scared/concerned so to never take that drug.
It's like, let's say, driving a car. I mean,in any country, almost everyday some unlucky people die from a car crash, so, in theory, you also can die anyday from a car accident.
Does that mean you won't get into a car again?
Isn't it the same with finasteride? Yes, there are some rare, very unlucky guys who have persistent sides after quitting. But there are others who take it for 20 years with no sides, and maintained hair. And there are tons of others who have succes with it.