[Solved] The open fields doctrine protects land from intrusion where owners have put up "no trespassing" signs. Sexual Drives: refer to the biological and psychological energies that influence an individual's desire for sexual activity. McCarthys' Sexual Styles: A conceptual framework identifying different styles of sexual expression and behavior as characterized by the research of McCarthy. Intrapersonal Activity: Activities or processes that occur within the individual's mind. Autoeroticism: The practice of achieving sexual pleasure through stimulation of one's own body.