What causes men's sexual dysfunction?

Men's sexual function decline is mainly caused by the following reasons: first, age factors, with the continuous growth of age, will gradually show sexual function decline, male sexual function normal in 20~30 around the peak, then will gradually decline; second, androgen decline, accompanied by age growth will also make male sex hormones gradually decline, but due to individual differences, the extent of decline will be different; Third, disease factors, if there is cardiovascular disease or diabetes, etc., will also lead to sexual dysfunction; fourth, mental factors and bad living habits, will also lead to male sexual dysfunction. For example, frequent alcoholism, staying up late or excessive mental stress.