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2018年1月20日星期六

sex education

1. Place condom on the head of the erect, hard penis. If uncircumcised, pull back the foreskin first.
2. Pinch air out of the tip of the condom.
3. Unroll condom all the way down the penis.
4. After sex but before pulling out, hold the condom at the base. Then pull out, while holding the condom in place.

cdc.gov

Most men ejaculate within a few minutes of starting to thrust during intercourse.

medlineplus.gov

According to parameters developed by the World Health Organization, the average volume of ejaculate for men is 3.7 ml, or roughly three-quarters of a teaspoonful.

menshealth.com

Low estrogen vaginal dryness is most often caused by a decrease in estrogen levels. Estrogen is a hormone that helps keep the tissues of your vagina lubricated and healthy.

everydayhealth.com

From a functional perspective, this means that the breast doubles as a truly sexual organ. It is not just an exciting visual stimulus for (most) men but also a key source of sexual pleasure for most women.

psychologytoday.com

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