Includes index.

Earlier editions were published with a different subtitle: It's perfectly normal : a book about changing bodies, growing up, sex, and sexual health.

Lots of questions. Changing bodies, growing up, sex, and sexual health -- What is sex?. Babies, kids, preteens, teens, grown ups : sex and gender ; Making babies : sexual reproduction ; Strong feelings : sexual desire ; Making love : sexual intercourse ; Who you are : straight, lesbian, gay, bisexual, transgender, queer, questioning, + -- Our bodies. The human body : all kinds of bodies ; Outside and inside : our sex organs ; Words : talking about bodies and sex -- Puberty. Changes and messages : puberty and hormones ; The travels of the egg : eggs and puberty ; The travels of the sperm : sperm and 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-Information : 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 : delay, postpone, abstain, prevent, control ; Laws and rulings : abortion -- Staying healthy. Helpful -- fun -- creepy -- dangerous : the internet and you ; Talk about it : sexual abuse ; Getting a checkup : sexually transmitted diseases ; Scientists working day and night : HIV and AIDS ; Staying healthy : responsible choices.

For age 10 and up.