With the rise in popularity of testosterone replacement therapy in the USA, online clinics are popping up everywhere. Yet many still follow outdated protocols from fifty years ago: weekly injections, ...

Male sexual heat is a common feature of wild animals like deer, elephants, and many bird species. It is related to annual increases in testosterone production that increases aggression and sex drive.

Similar to monthly hormonal cycles that many cisgender women experience, cis men also experience hormone cycling with testosterone, a masculinizing sex hormone. Rather than monthly cycles, though, ...