[cafemachiavelli]

Source on the sterility?

Afaik all that happens is that estrogen inhibits the pituitary, which will temporarily shut down testosterone and sperm production. But with patience or sufficient antiestrogens, those can be restarted. (Testicular atrophy is another factor, but that takes much longer to occur is also reversible)

Which isn't to say that estrogen is harmless. Without proper therapy, the hormonal shutdown can take many months to undo itself, and gynecomastia can usually only be resolved by surgery.