DETROIT –  The son of sex research pioneer Dr. William H. Masters has been charged with exposing himself to a sheriff's deputy and another woman who were posing as recreational kayakers as part of a sting operation on a Michigan river.

Huron County Sheriff Kelly Hanson says a completely nude William H. Masters III yelled for the women's attention Saturday, then made obscene gestures.

Hansen says deputies requested backup from a Michigan conservation officer who nabbed Masters, a 60-year-old Southampton, N.Y., resident who owns property nearby.

He's charged with aggravated indecent exposure, punishable by up to two years in jail.

Masters made an initial court appearance Tuesday. He didn't return calls seeking comment Wednesday.

Masters was arrested in New York's Central Park in May after an officer reported seeing him masturbating.