AURORA, Colo. -- Before you download that free cellphone application to entertain your children, some parents are warning an X-rated ad could be just a touch away.

Melissa Price, of Aurora, learned the hard way with her three-year-old daughter, Melody.

"I can get 15 minutes peace and quiet letting her play her memory games," said Price.

A few days ago, after downloading a free coloring app, her little girl accidentally hit one of the ad banners and got an eyeful.

"It said, 'Live Chat,' 'Live Adult Chat,' and 'Kimmie is waiting to talk to you now,' across the top of it," said Price. "It's ridiculous. The fact is that if she can get to that website, she's going to see all sorts of pictures, and I'm going to have to explain what it is."

It's not an isolated incident. In Florida last year, a local TV station reported a 5-year-old who was using a coloring Dora the Explorer application ended up on a pornography site.

"All it takes is a slip of the finger from coloring to naked women on the phone," said her father.

On the Android Market, 7NEWS found recent reviews for several coloring apps that indicating off-color ads.

One review on a coloring princesses application stated: "Ad content is X-rated and not appropriate for anyone young enough to play this game."

Cyber security expert Steve Beaty said times have changed.

"When I was young you had a coloring book," said Beaty. "All of a sudden, now, you have this little handheld device. But that little handheld device is a very powerful computer that can track your every move."

Beaty said application developers hire ad firms to make them money. Some of those firms restrict adult ads, but many don't.

"Historically, most of the application developers would go where they thought they could make the most amount of money," said Beaty. "But that’s changing."

When we checked with the coloring application developer who had all the bad reviews, he replied via e-mail stating, "We terminated the partnership with the old ad network. We noticed the comments and tried hard to resolve it."

Beaty said the easiest way for parents to prevent porn pop-ups is to buy the application. He said it's safer to go through the Apple store or Android Market, where parents can also find child-safe browsers.

But currently, Beaty said, no filters can stop the pop-ups on free applications.

Also, he said, be sure to turn off the GPS location on kid's apps. There is no reason the developer needs to know your child's location.

"It if means I don't have to risk her going somewhere she shouldn't, fine!" said Price. "Put three dollars on my bill. I don't care. Better safe than sorry."

Beaty said if users come across an inappropriate ad, contact the app developer or the distributor to let them know as soon as possible