"There are widely different perspectives on public sexual activity. Some do not believe the behavior constitutes a public safety threat; some view the behavior as a 'victimless crime' involving two consenting partners; and some see the behavior as a threat to the community's 'moral decency.' This guide is intended to inform law enforcement about the effectiveness and consequences of various approaches to controlling public sexual activity."
Problem-Oriented Guides for Police, Problem-Specific Guides Series No. 33
Office of Community Oriented Policing Services: http://www.cops.usdoj.gov/