Here's a study from a spam blocking software company. I'm actually surprised the porn spam numbers aren't higher than what they claim.
from CNN:
http://www.cnn.com/2003/TECH/internet/06/0...reut/index.html
One in five children opened and read spam, the study found, and more than half of the them checked e-mail without parental oversight.
Among the other findings in the survey:
• 80 percent of the respondents said they are bombarded by sweepstakes messages.
• 62 percent received spam touting dating services.
• 47 percent received e-mails with links to pornographic Web sites.
• 34 percent have felt uncomfortable receiving spam.