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We compared the male sexual partners of teen girls, age 15 - 19 years-old, currently infected with a sexually transmitted infection STI versus the male partners of adult women, age 20 - 41 years-old, with an STI to determine risk factors in these high-risk sexual dyads related to the male partner. Interview of men who were partnered with teen girls and adult women, enrolled in Project Sexual Awareness for Everyone SAFE , a randomized controlled trial of behavioral intervention to reduce recurrent STIs. Men partnered with teens were younger and had significantly more sexual partners per year sexually active, shorter relationship length, and shorter length of monogamy with the index girls. Young age independently predicted STI infection in men.
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Female Reproductive System

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Puberty: Adolescent Female

The teenage years are also called adolescence. During this time, teens will see the greatest amount of growth in height and weight. Adolescence is a time for growth spurts and puberty changes. A teenager may grow several inches in several months followed by a period of very slow growth. Then they may have another growth spurt.
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The Answer to Your 15 Most Embarrassing Sex Questions

Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not essential to keeping an individual alive. In the human reproductive process, two kinds of sex cells, or gametes GAH-meetz , are involved. The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female's reproductive system. When sperm fertilizes meets an egg, this fertilized egg is called a zygote pronounced: ZYE-goat.
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Sex is confusing. Chances are, whether you're about to embark on your first experience with sex, or you've done it multiple times, you probably still have a ton of questions. What's sex really like?
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