The coitus is a normal physiological phenomenon, even if it is a physiological phenomenon because of the different ages of people, people’s physique is different and the frequency is different, or the duration is different, there is no hard and fast rule which one is normal, or which one is not normal. So, if two times a week intercourse is also normal phenomenon, only because the body is more fatigue, or older in the case of physical decline, may lead to a decrease in the frequency of coitus, coitus duration will also be reduced, also belong to the normal phenomenon, as long as the coitus does not feel fatigue, and can achieve orgasm, there is no other uncomfortable situation are all belong to the normal phenomenon. The most important thing to remember is that you should be able to have an orgasm without any discomfort. It is recommended that the sexual life process must be correct mindset, do not compare, as long as they can adapt to the frequency and duration of sexual life, and can achieve orgasm, both spouses have no regrets in the case is normal.