性交不是一种单纯的体力活动,涉及生理、心理和伦理等方面的问题.单从体力负担上看,它和通常的步行、二级梯或踏车运动相比,不但体位及参与的肌群不同,而且在性高潮时往往还可能有肌群的等张与等长收缩同时存在.冠心病人多在40岁以上,一般人在35岁后性交频率开始下降,性功能不全(阳萎)者增多,但若保持性交频率则似可减低性功能陡降. Sexual intercourse is not a purely physical activity involving physical, psychological and ethical issues, etc. From the perspective of physical exertion alone, compared with the usual walking, two ladder or treadmill exercise, not only the body position and the participating muscles Different, but also in the orgasm often may also have muscle isometric and isometric contraction exist at the same time. Coronary heart disease more than 40 years of age, most people in 35-year-old after the beginning of sexual intercourse frequency decreased sexual dysfunction (impotence) who Increase, but if you maintain the frequency of intercourse may seem to reduce the steep decline in sexual function.