31% of all Sexual Violence happens within a relationship.
The campaign has been developed jointly between the Police and Crime Commissioner's office, Lancashire Victim Services and Lancashire Constabulary.
It comes as part of Sexual Violence awareness week.
Speaking at an awareness event at Blackpool Teaching Hospital Mr Grunshaw said: "Any form of sexual violence is clearly unacceptable."
"We know that 31% of all reported rapes in Lancashire happen within relationships. This is shocking and we have to send out a clear message that being in a relationship does not equate to having the right to force or coerce your partner into anything they don't want to do."
Dee Conlon, Operations Manager at Lancashire Victim Services added:
"Sexual violence is a terrible crime that has a long lasting impact on those affected."
"It can happen to anyone, from any background, male, female, young or old. Our specialist case workers are here to provide emotional support and help you to find the best way forward."
Leaflets and messages will be shared on websites and across social media to raise awareness and direct people to Lancashire Victim Services for help and support.