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Brain and body HOI
Male sex organs
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abdomen acid activity alcohol average bacteria barbiturates become bladder blood vessels body bone brain Calories cancer cause cells chemical cholesterol chromosome cigarettes clitoris common cycle damage death depends develop diet disease disorders drinking drug eating effects ejaculation energy example exercise factors fallopian tubes female fertilized fluid follicle function genitals gland gonorrhea growth hair heart hernias high blood pressure homosexual hormones illness increase infection inflammation intercourse intestine irritation kidney lungs male masturbation menstrual cycle menstruation mental muscle muscular needed nerve nervous system normal occur organs orgasm ovulation oxygen pain partner penis person physical physical dependence pill pregnancy produce prostate protein psychological puberty result semen sexual skin sleep smoking somatotype sperm stimulation stomach stress suicide symptoms syphilis teeth tissue tobacco Treatment tube tumor types ulcers urethra urine usually uterus vagina vary vitamin weight woman women