Is it okay if your testicles are different sizes and one is harder then the other? I remember first noticing one felt harder about a year ago then forgot about it. I was examining myself again tonight and became worried by it.
Testicles are usually different sizes and one hangs lower than the other. As long as you don't have a hard lump in either testicle I don't think one being firmer than the other is unusual. Firmness varies from day to day depending upon several factors.