Ben Cousins, who makes adult apps as well as other apps targeted at 20-something males, says that once an app falls off those lists, "sales can be pretty dismal." Even holding a place on those lists doesn't necessarily prove lucrative.

Ben consistently has multiple apps on the top 100 lists of several categories -- something only a handful of other adult app developers can boast -- but says, "I still work a full time day job and won't be quitting anytime soon." One rare winner is a free app called "On the Go Girls," which claims well over 2 million downloads a month.

Here's the real surprise: Not many of them are making that much money, however.

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They could do even better if Apple's ratings and policies were more lenient, according to "On the Go Girls" developer Frederick Clarke.

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You can view our latest test results here: Best webcam sex sites for Android mobile devices and smartphones.

Until recently, most webcam sex sites were a desktop only experience.

Unfortunately, those same devices tend to be somewhat fussy when it comes to enjoying interactive adult content.

Most adult webcam sex sites require Flash to stream video, which both IOS and the latest versions of Android lack.

To succeed, they need to stay on the top 100 list for one of several porn-friendly categories, including "Lifestyle" and "Photography.