"New edition, 20th anniversary"--Cover.

Includes index.

Lots of questions. Changing bodies, growing up, sex, and sexual health -- What is sex? Girl or boy, female or male : sex and gender ; Making babies : sexual reproduction ; Strong feelings : sexual desire ; Making love : sexual intercourse ; Who you are : straight, lesbian, gay, bisexual, transgender -- Our bodies. The human body : all kinds of bodies ; Outside and inside : the female sex organs ; Outside and inside : the male sex organs ; Words : talking about bodies and sex -- Puberty. Changes and messages : puberty and hormones ; The travels of the egg : female puberty ; The travels of the sperm : male puberty ; Not all at once! : growing and changing bodies ; More changes! : taking care of your body ; Back and forth , up and down : new and changing feelings ; Perfectly normal : masturbation -- Families and babies. All sorts of families : taking care of babies and kids ; Instructions from Mom and Dad : the cell-- genes and chromosomes ; A kind of sharing : cuddling, kissing, touching, and sexual intercourse ; Before birth : pregnancy ; What a trip! : birth ; Other arrivals : more ways to have a baby and family -- Decisions. Planning ahead : postponement, abstinence, and birth control ; Laws and rulings : abortion -- Staying healthy. Helpful-- fun-- creepy-- dangerous : texting, messaging, e-mailing, being online ; Talk about it : sexual abuse ; Getting a checkup : sexually transmitted diseases ; Scientists working day and night : HIV and AIDS ; Staying healthy : responsible choices.

Introduces human sexuality, describes the changes brought about by puberty, and discusses sexual abuse, sexually transmitted diseases, AIDS, and pregnancy.

10 and up.