I had libido problems the first time I took
lexapro, which is one of the reasons I stopped taking it.
However now I am back on a much lower dose (1/8 of a 10mg tablet!) and have no problems at all- in fact I'd say my libido has increased because the depression was killing it.
I think the side effects increase exponentially with the size of the dose, and a lot of doctors overprescribe. I'd suggest taking as little as you can and still have an effect (try 1/4 of a pill).
I am a petite woman, but I know a 200lb man who takes 1/2 a tablet and he says this works for him with no side effects. I think that very few people should really be on a whole 10-20mg.
I feel like I'm on the perfect dosage now-- I'm not anxious or depressed anymore, but otherwise totally feel like myself-- not spacy, giddy, etc.
Good luck!