coppa-child-online-privacy-and-protection-act

What is COPPA?
COPPA, or the Child Online Privacy and Protection Act of 1998, is a law in the United States requiring websites which can potentially collect information from minors under the age of 13 to have written parental consent or some other method of legal guardian acknowledgment, allowing the collection of personally identifiable information from a minor under the age of 13.

At an adult content web site if you are unsure if COPPA applies to you when you register contact webmaster to register or contact legal counsel for assistance.

Reference

http://www.pregnancy-forums.com/faq.php