[Solved] -In the figure, which number identifies the head? A)5 B)4 C)2 Testosterone: A primary male sex hormone that plays key roles in health and well-being, including regulating sex drive, bone mass, fat distribution, muscle mass, and the production of red blood cells. Sexual Interest: Sexual interest refers to a person's desire or attraction toward others, which can vary in intensity and target across the spectrum of sexuality. Erotic Plasticity: Refers to the degree to which an individual's sex drive can be changed by societal or environmental factors. Same-Sex Attraction: Romantic or sexual attraction towards individuals of the same sex.