SCIENCE CORNER STRUCTURE & FUNCTION OF THE TESTES   The testes are more than just sperm glands. Explore the intricate structure of the "family jewels." THE PHYSIOLOGY OF AROUSAL & ORGASM   A lot goes on inside you when you work your way to orgasm. Includes the differences between men and women regarding sexual response. SEMEN COMPOSITION   Semen is an incredibly complex and interesting fluid. Here's the lowdown on all the stuff it contains and where its components come from. SEMEN PRODUCTION & EJACULATION   A study of the male reproductive system and how everything works together to produce an ejaculation. PENIS ANATOMY & ERECTION   A look at the intricate internal structure of the penis and what happens in your body when you get an erection.

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