Introduction. Perspectives on sexuality -- Sex research: methods and problems -- Gender issues -- Biological basis. Female sexual anatomy and physiology -- Male sexual anatomy and physiology -- Sexual arousal and response -- Sexual behavior. Love, attraction, attachment, and intimate relationships -- Communication in sexual behavior -- Sexual behaviors -- Sexual orientations -- Sexuality and the life cycle. Contraception -- Conceiving children: process and choice -- Sexuality during childhood and adolescence -- Sexuality and the adult years -- Sexual problems. The nature and origin of sexual difficulties -- Sex therapy and sexual enhancement -- Sexually transmitted diseases -- Social issues. Atypical sexual behavior -- Sexual coercion -- Sex for sale.