(BAD AXE) -- The son of the late sex research pioneer Dr. William H. Masters has pleaded guilty to an indecent exposure charge for exposing himself to a Huron County Sheriff's deputy and another woman on the Pinnebog River. William H. Masters III made the plea Monday in Huron County Circuit Court in Bad Axe. The crime carries up to two years in prison, and sentencing is February 11th. Authorities say a completely nude Masters yelled for the women's attention on September 1st, then made obscene gestures. Masters is a 60-year-old resident of Southhampton, New York. He pleaded guilty last week to a lewd act in Central Park back in May. Masters avoided jail time in that case, but if he gets arrested again he'll face up to 90 days in jail.