Viagra, medically known as sildenafil citrate tablets, is primarily used to treat erectile dysfunction, is not effective in prolonging sexual intercourse, and is generally not recommended for use. Sildenafil citrate is commonly prepared as tablets. Clinically used for the treatment of erectile dysfunction, it can improve male erectile function, but the effect of prolonging sexual life time is not obvious. Sexual life time is mainly affected by personal constitution, age, sexual experience and environmental factors, generally speaking young people, newlyweds, long goodbye people ejaculate fast are normal phenomenon, do not have to worry too much. With age, sexual experience increases, sexual excitement decreases, most men sexual life time has increased. It is recommended to abstain from sexual intercourse. The most important thing to remember is that you can’t be too careful with the way you look at your body. If the sexual life time is shorter than 2 minutes, then consider premature ejaculation, you can promptly seek medical advice, consult the doctor to take appropriate treatment.