"Nine" appears frequently in ancient sex books. For example, when talking about sexual postures, there are "Nine Positions"; when talking about situations that are not suitable for sex, there is the saying of "Nine Disasters"; when it comes to guiding sexual movements, Emphasis on "nine shallow and one deep". And ancient books about the rhythm of sex are also inseparable from "nine".

Sexologist Meng Yongsheng pointed out that the "three laws of ninety-nine" is a rule that the ancients respected to comply with the rhythm of sexual intercourse. It conforms to the female orgasm pattern and can gradually increase the pleasure.

To be specific, after sex begins, first stab the woman's vaginal opening shallowly, counting from one to nine; then go deeper, but do not touch the bottom, and count the second time at nine; finally reach The deepest part of the vagina, stay still for a while, count to the third time nine.

Modern medicine points out that only the outer 1/3 of the female vagina has tactile nerve endings. Effective stimulation of this area can help women obtain sexual pleasure to the greatest extent. At the same time, the twitching during sex should be balanced and rhythmic, so as to create waves of pleasure.

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