SEX SEX SEX (or Reproduction) How do organisms make new organisms? By Reproduction How do we know about Reproduction? Through observation.

Ancient times: Isis, Egyptian goddess of fertility – does she make babies? Aristotle: “Babies come from the man! The woman merely carries it!” Modern Science: Sperm and egg create the single cell that will divide into the trillions of cells of the human body.

What do sperm do?

Stages of Pregnancy

Penis Size Alfred C. Kinsey Institute for Sex Research Average Size

Riskiest Sexual Activities Having vaginal or anal intercourse without a condom Multiple partners Sharing sex toys without using a new condom for each user, or without cleaning them between users.

Sex Risk Facts Teenage women and men have the fastest increasing rates of HIV infection in the U.S. – takes only 1 exposure to get HIV. 72% of U.S. teens have vaginal intercourse before they graduate from high school. More than 10 percent do not graduate, and those who drop out have increased rates of drug use. Women and men between 15 and 25 have the highest rates of sexually transmitted infections in the U.S.