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一些青年夫妇在过性生活时,采用体外排精的避孕方法,这种方法看起来简单易行,但却有许多害处。容易导致避孕失败体外排精是指在性交达到高潮,即将射精的瞬间,立即抽出阴茎,使精液排在外面。这种自然避孕方法有时达不到避孕目的,这是因为性交处于高潮时,会有一小部分精液伴随输精管的收缩而溢出流入阴道,这些精液量虽少但精子数目最多,因此容易受孕。容易引起性神经衰弱男子在性生活整个过程中,其性反应是大脑皮层控制下完成的。性交中的心理和生理刺激会
Some young couples who use sex-in-vitro contraceptive methods when they have sexual intercourse may seem simple and easy to do, but they have many disadvantages. Easily lead to contraceptive failure In vitro ejaculation refers to the climax of sexual intercourse, about the moment of ejaculation, immediately remove the penis, so that the semen on the outside. This natural method of contraception sometimes falls short of contraceptive purposes because at the climax of sexual intercourse there is a small percentage of semen that spills into the vagina with the contraction of the vas deferens that are less likely to conceive but have the highest number of sperm. Easily lead to neurasthenia Men’s sexual life throughout the process, the sexual response is done under the control of the cerebral cortex. Psychological and physical stimulation in sexual intercourse