" Men who are in relationships tend to have lower levels of testosterone, but we don't know when that transition occurs...There is no longitudinal research in hormone studies, " Mahmut said.

“恋爱中的男性睾丸激素水平往往较低，但我们不知道这种转变是何时发生的… … 激素研究没有纵向研究，” 马赫穆特说。