The male coitus will be soft for a while is the phenomenon of weakness. May be men have sexual dysfunction erectile dysfunction, due to the penis by the sexual stimulation caused by insufficient, may be because of the usual excessive masturbation, masturbation will be on the penis stimulation is very big, over time will result in the penis needs a lot of stimulation to be able to fully erectile. In addition, men will appear weak phenomenon, but also may be related to psychological reasons, if the two sides because of unpleasant things or too nervous will appear weak symptoms, but also does not rule out the possibility of suffering from reproductive diseases, suffering from prostatitis disease patients will appear erectile dysfunction, leading to do it on the soft. If men have the above symptoms, they should go to the hospital in time to do a checkup, for prostate disease should be treated immediately, so as not to delay the condition.