Images of humans engaged in sexual intercourse display the truth about reproduction also. Many small children and indeed many adults do not know what it really looks like.
Many people would be shocked and disgusted to see such a thing on their public streets. It really does not matter what most people think about the message or messanger. Maybe, just maybe the disgust produced by see humans engaged in sexual interourse would prevent some teenage prganancies and thereby prevent some abortions.
Are you kidding or what? Have you been to the movies?