It is normal to masturbate and ejaculate faster than sex, which does not necessarily mean premature ejaculation. The reason is mainly the following: 1, the psychological effect: masturbation masturbation is to orgasm ejaculation for the purpose, naturally want to reach faster, psychological implication ejaculation will naturally be faster; 2, different stimulation intensity: masturbation masturbation in order to reach ejaculation climax as soon as possible, usually increase the strength, jerking frequency faster, and sex by physical and physical limitations, although the vagina is also very tight, but the thrusting frequency is much slower