Is there a safety whistle for men?

I'm thinking about designing a safety whistle specifically for men. It will have it's own unique calling sound. Men will be taught that when they hear it, it means that a fellow man is being a victim of female violence, and although he can defend himself, he requires witnesses prior to acting in defense in fear that his side of the story would never be believed by a court.

http://www.youtube.com/watch?v=CRCS6GGhIRc

Certain patterns of whistle blowing could inform others whether the attack is by a single female, several females, or female proxy violence i.e White Knight attack.