Which of the following class of chemicals exerts its effects by entering cells, binding intracellular receptors, and affecting gene expression?     a. Peptides     b. Steroids     c. Bioactive amines     d. Amino acids   Studies have demonstrated biological differences between adult heterosexual and adult homosexual men. Which of the following has been shown to be different between these groups?     a. different pattern of cortical neuron branching     b. different testosterone levels     c. different size of a hypothalamic nucleus     d. different estrogen levels

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Sexual Motivation

Sexual motivation refers to a person's overall desire for sexual activity. It is an unusual motivation. Generally, among lower animals, the term 'drive' is commonly referred to as sexual motivation. It means a certain internal force drags the animal to be involved in reproductive behavior. On the contrary, humans are not simply driven by any internal force; rather, the sexual motivation in humans is due to several factors such as biological (hormones, genes), environmental (familial upbringing, chemical exposure) and physiological factors (culture, desire) which further determine engagement in sexual activities.