add missing age limit to a couple of sites

[iwconfig]

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Description of your pull request and other information

I used the script written by @remitamine at #6497 (comment) to remove all extractors with age limit over 17. I then checked to see if it missed anything with grep -Rvil age_limit youtube_dl/extractor | grep porn and yourporn.py showed up. I tried every sexy keyword i could think of and also found

camtube.py
cammodels.py
camwithher.py

[polenta789]

Hi,
How can I add the missing age limit, all this code lines?

[iwconfig]

@polenta789 They've already been merged with into the master branch. Download and install a version of youtube-dl released 1 January 2019 or later and you're all set.