Yes, 4 On Demand does offer parental control. You can choose a 6 digit pin number to restrict access to any channels you deem unsuitable for general viewing.
4 on Demand does offer parents a control feature which allows a variety of control measures that enables them to select which programs they deem suitable for viewing. Rating, and timing are some factors under the parents control with the feature.
Parental Control - 2005 4-4 was released on: USA: 28 March 2007
Parental Control - 2005 4-10 was released on: USA: 25 March 2007
Parental Control - 2005 4-11 was released on: USA: 10 April 2007
Parental Control - 2005 4-15 was released on: USA: 17 May 2007
Parental Control - 2005 4-16 was released on: USA: 14 July 2007
Parental Control - 2005 4-19 was released on: USA: 10 June 2007
Parental Control - 2005 4-20 was released on: USA: 7 May 2007
Parental Control - 2005 4-24 was released on: USA: 11 June 2007
Parental Control - 2005 4-25 was released on: USA: 17 June 2007
Parental Control - 2005 4-26 was released on: USA: 23 July 2007
Parental Control - 2005 4-27 was released on: USA: 20 July 2007