It depends on how you look at it.
1.) The guy turns the condom color and then the guy knows it is him.
2.) The girl turns the condom color and they the guy knows to never touch her again.
Heck, you could market a "Home STD testing Kit"... Big Brother will no longer know you have herpes
Solitare for years. No violence to date.
3) Bonzi Buddy
It depends on how you look at it. 1.) The guy turns the condom color and then the guy knows it is him. 2.) The girl turns the condom color and they the guy knows to never touch her again. Heck, you could market a "Home STD testing Kit" ... Big Brother will no longer know you have herpes
They should make a condom that contains plant material that can detect STD's and change colors accourdingly.