261.5. (a) Unlawful sexual intercourse is an act of sexual
intercourse accomplished with a person who is not the spouse of the
perpetrator, if the person is a minor. For the purposes of this
section, a "minor" is a person under the age of 18 years and an
"adult" is a person who is at least 18 years of age.
(b) Any person who engages in an act of unlawful sexual
intercourse with a minor who is not more than three years older or
three years younger than the perpetrator, is guilty of a misdemeanor.
(c) Any person who engages in an act of unlawful sexual
intercourse with a minor who is more than three years younger than
the perpetrator is guilty of either a misdemeanor or a felony, and
shall be punished by imprisonment in a county jail not exceeding one
year, or by imprisonment in the state prison.