What's a *convestion*? You mean conversation? As in; this forum thread?
'sex' has one of the highest *keyword* volumes and also one of the highest levels of competition.
You are asking a question that has no answer other than a general opinion that is basically useless.
Without specifying the interest intention of the traffic you seek there is no possibly definitive (useful) answer.
example: keyword for diet traffic would be [_______] <<< that might have possible answers
you are asking: [keyword] >>>[?] answer: ?
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