Human Sexuality: Essentials

abortion accepted activity adolescence appears become begin behavior birth blood body boys breasts called cancer cause cells cervix changes child common considered contraception couple culture cycle desire develop disease early effects ejaculation emotional erection erotic estrogen example experience fact fear feel female fertilization genitals girls give gland heterosexual homosexual hormones human important increase individual infection involves known laws less lives major male marriage married masturbation means menstrual method months moral mother normal occur organs orgasm pain parents partner penis percent period person phase physical Pill placenta pleasure position possible pregnancy prevent problems produce question rape relations relationship response result roles sense sexual intercourse social society sometimes stimulation symptoms syphilis tion touch tube usually uterus vagina woman women young