The TLD is a neutral according to Google Webmaster.
Content and other technical factors are suppose to rule in the algo.
.com was delegated 18 yrs ago
.xxx was delegated 6 yrs ago
If 25% of the internet is 'adult' .xxx has less that a proportionate share of domains registered even if you prorate for the delegated years.
How many .xxx domains are branded with good content -- why should they even be in the topserps?
Old school EMD is dead but the string (the TLD extension) should be a memorable part of branding. Gaming Google (all search) is a dated strategy that doesn't work now anyway. The main thing is having a short and memorable name.
Most .com domains rank low because of their content -- less than 1% make it to page 1 really. If you have crap content on a .com and crap content on a .xxx they are both going to be on page 40 (#401 - 411) side by side.
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