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AIDS - acquired immune deficiency syndrome; fatal disease characterized by inability of body to fight various infections due to HIV virus, which attacks immune system, transmitted by direct contact of body fluids
secondary sex characteristic - feature, such as body hair or breasts, that differentiates males and females but is not directly connected to production of egg or sperm
sex - basic division of a species into male and female, for purpose of reproduction; sexual activity; instinct or attraction drawing one sex toward another; sexual intercourse; genitals
sex change operation - surgical reconstruction of one's sexual organs as those of the opposite sex
sexually transmitted disease - any of various infections acquired through contact of sexual organs, including AIDS, ARC, chlamydia, crabs, gonorrhea, herpes simplex, pubic lice, syphilis, trichomoniasis, veneral disease, and yeast infection; veneral disease