I think most web surfers search without quotes "".
Unless it's one of those phrases that return irrelevant search results, people then search with keywords in quotes. That's, if they're Google savvy.
Competition-wise the keyword phrase "free porn video download" is highly competitive even for all in title searches.
free porn video download
About 99,200,000 results
"free porn video download"
About 1,670,000 results
allintitle:"free porn video download"
About 25,500 results
Definitely research for, high search, low competition phrases, and optimize pages accordingly.
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