Final answer:
Eysenck's theory does not describe introverts as being sexually dysfunctional; this trait is not related to introversion according to the theory.
Step-by-step explanation:
According to Eysenck's personality theory, an introvert is characterized by being quiet and reserved, having a few close friends, and keeping their feelings under close control. These are all traits typically associated with introversion. However, being sexually dysfunctional is not a characteristic described by Eysenck's theory for introverts. It is important to note that sexual dysfunction can be influenced by a variety of factors and is not related to being introverted.