Chlorine can metabolize into an estrogen-like substance inside the human body.
The goverment knew this for years, but because chlorine is on the GRAS list, they couldn't ban it. One out of approximately 25-80 thousand men is a transsexual, and approx one out of 100 thousand females is a transsexual. The first documented sex change was performed in the early 50's, a few years after chlorine was introduced into most american cities. Chlorine wasn't used as a disinfectant until very recently in human history. Even today, there are cults in asia that have transgenderism as a part of their rituals.