The middle years: the sexually active middle adult.
D000375:Aging; D002908:Chronic Disease; D003075:Coitus; D005114:Extramarital Relations; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008297:Male; D008418:Masturbation; D008593:Menopause; D008875:Middle Aged; D009732:Nursing Care; D012737:Sex Factors; D012725:Sexual Behavior; D012735:Sexual Dysfunction, Physiological; D012922:Social Change