Guiding men on how to become sex masters (adult novels on sex knowledge)

We always think that sex should make both parties reach orgasm. But sex is more than just about genitals. Recently, the American magazine "Men's Health" published an article to guide men on how to become sex masters.
1. How often do you have sex per week?
Having moderate-intensity sex 2-3 times a week can improve your breathing rhythm during sex. If sexual activity exceeds 5 hours in a week, it can be considered excessive. Excessive sexual activity can cause testosterone levels to drop by 1/3, and people will also feel very tired.
2. What kind of sexual environment would you create?
According to research, women who watch erotic movies during sex will continue to release a type of female hormone that increases comfort for 2 hours. A study by the State University of New York found that listening to new music during sex can distract your attention and affect the quality of sex. Therefore, it is best to listen to some music that both of you are very familiar with during sex, especially some minor tunes with cheerful rhythm.
3. What is your foreplay?
A report in the journal Nature Neuroscience stated that women's sensitive nerves are distributed in large numbers on the inner sides of their arms and thighs, so you should caress her arms a few minutes before sex. Also don't forget to use your saliva. Biochemists at Lane University found that testosterone levels in male saliva are four times higher than in female saliva. Therefore, men’s saliva is the most natural “aphrodisiac” for women.
4.What kind of sex position do you like?
"For women to orgasm, the vagina, urethra and clitoris all need to be stimulated accordingly," said Gott Horsteg, a biochemist at the University of Grüningen in the Netherlands. "This can be achieved by constantly changing positions."
5. How long can you last after insertion?
The Journal of Sexual Medicine reports that if penetration lasts less than three minutes, the chances of the female partner achieving orgasm are reduced by 80%. If penetration lasts more than 13 minutes, both parties will feel uncomfortable. The researchers concluded that the optimal insertion time is 3-13 minutes.
6. What do you do after sex?