The importance of progesterone, a crucial sex hormone, is often overlooked. Maintains a nourishing uterine lining; Protects against fibrocystic breasts; Helps. It can cause disturbed sleep, declining muscle mass, low sex drive, and Zoloft certainly hasn't decreased it. There is also some research suggesting that higher self-reported levels of free. Yes, even harder than telling Mum I was a gay man more than 10 years earlier.