Understanding of sex at home and abroad to study some professional knowledge

China's sex education is very backward, and many people want to learn professional knowledge, but knowledge is not professional, get a lot of friends on the Internet as a bad sexual knowledge, and psychological distress, in fact, the most common is the knowledge about masturbation,

When the passion "condom" problems

Condom is an opening for rubber circle, the top have a utricle, tubular thin latex products. Set in the penis may prevent sperm into the vagina, to avoid sperm and egg meet and contraception in order to achieve the purpose.