Earlier sexual initiation may be explained partly by the decline in the age at which puberty begins in boys and girls. The influence of testosterone, a hormone that motivates people to engage in sex, is an important and often overlooked factor in the sexual behavior of young men. Young men are more likely than young women to be sexually active, to have multiple partners, and to have intercourse with casual acquaintances. The average age of first sexual activity varies by country, but most young men have had sex well before age 20. Limited knowledge, limited protection.
Most young men have a lot to learn before they can become responsible sex partners.
Millions of young, unmarried men are having sexual relations but know little about the consequences. Condoms were the most common choice of men in the 14 surveys as a whole. Paulo, the Pill was the most commonly used method. The younger that people are when they become sexually active, the more likely they are to have multiple sexual partners. Even when young men do know about STDs, inexperience or denial as well as cultural pressures can make them take unnecessary risks.