1. pertaining to, characterized by, involving, or endowed with sex, sexuality, the sexes, or the sex organs and their functions. 2. characterized by the property of maleness or femaleness. 3. pertaining to reproduction involving both male and female gametes. 4. implying or symbolizing erotic desires or activity. sexual arousal disorders sexual dysfunction characterized by alterations in sexual arousal; see female sexual arousal disorder and male erectile disorder.