This thread has been made several times before - please use the search button next time.
I believe there was a panel in the manga where an Uchiha woman was shown with Sharingan unlocked but I'm not certain where. Anyway, there is no reason to believe that only the men could unlock the Sharingan. One needs to go through an emotional event to unlock the Sharingan, so it's not like only men could go through emotional events.
Fact of the matter is that not many Uchiha women were shown. The story focuses on a couple of the Uchiha men mostly, so it's natural that there is no focus on Uchiha women - especially not considering practically everyone of the clan is dead