Some goods are more suitable for electronic trade than others. Books and electronic equipment are easily and accurately described on Web pages - clothing and art may or may not be as depicted. There are many websites on the Internet that display and sell pornographic pictures. Some of these sites take active measures to assure that pornographic images are not available to children, but many do not. The screening mechanism for determining whether or not the site visitor is an adult is the assumption that if a credit card is available, then the visitor must be at least 21.
Many children are clever enough to circumvent the screening methods employed.
If the child has access to a credit card, instruct the child never to give it out over the Internet. Instruct your child to talk to you if he or she ever finds anything on the Internet that makes them feel uncomfortable. Maintain a continuing dialogue with your child. This does not mean constantly peering over his or her shoulder, but take some time to find out what Internet services your child uses and why. Consider restricting your youngster's searches to known worthwhile sites.