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okay, tell me what happen when any one searches by keywords like porn movies, sexy videos.. in search engine.Then search engine show your result.
You said that Google not show result for mature site...

Hi there,

Google sandbox simply is when Google penalized your site for a while due to some suspicious activity on your site leading them to think you are tricking its algorithm to get your site ranked on the result pages...so my advice is you always doing things very carefully!! regards!!