Sentence:  [W]hen adults with mild mental retardation are allowed to express their <WSD>sexuality</WSD> in appropriate ways, they are, in general, competent in terms of biological capability, sexual desire, and the psychological significance they attribute to sexual behaviornb.... However, they typically lack basic information about <WSD>sexuality</WSD> that would enhance their ability to engage in intimate relationships, as well as help them to be aware of the implications of that behavior and to protect themselves from exploitation. 
Meaning of the word marked with <WSD> tags:  Sexual activity; concern with, or interest in, sexual activity.