[Solved] All neurons are covered by myelin. Sexual Fantasies: Imaginary thoughts or daydreams about sexual desires or activities. Maternal Genetics: The field of genetics that deals with the transmission of genes and traits from mothers to their offspring. Bisexual Attractions: Bisexual Attractions describe a person's romantic or sexual attraction to more than one gender, not exclusively to people of a different sex or the same sex. Erotic Plasticity: The degree to which an individual's sex drive and sexual preferences are shaped by cultural, social, and situational factors.