As long as you stay on 1mg a day you will be fine! And even if you do have side effects (not very likely) as soon as you stop taking it they will go. I stupidly upped my dosage to 5mg a day and lost all my libido (desire for sex) which I thought nothing of at the time because I wasn't in a relationship. However I started a relationship and realised I could not get an erection....it was the darkest time off my life! And of cause you research into it on the internet and the only things you see are worse case scenarios....I honestly thought id never get an erection again from what I read. It was horrific! I was looking at viagra, penis implants! the lot! I think the anxiety of what I read was causing me more problems that the actual medication...the mind is a powerful tool! anyways I stooped taking 5mg a day and within 2 weeks everything was back to normal! Looking back now those 2 weeks seemed to last a lifetime!!!
On a side note since reverting back to 1mg from 5mg I have had an amazing development...I don't know if its related but now after I ejaculate I can still maintain a rock hard erection! My girlfriends like are you on Viagra! If anyone has an explanation for this I'm all ears...Im obviously not gonna see a doctor about it because why would I want it to stop!
So honestly give it a go and do not worry because if you get side effects you just stop taking them. There are alot of vocal people on the net about how propecia ruined their sex lifes and I feel sorry for them but they are a very loud very small minority. Millions on men take propecia with out any or very small side effects so I really would not worry!