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It really depends on your approach of advertising with them. If you're doing only exact matches, then I would suggest as many keywords as possible that stem off your primary keywords.
ex: [teen sex] [teen sexy] [teen sex 18] [teen sex girl], etc...
where "teen sex" is your stemmed word.
But if you're doing broad or phrase matches, then you'll get the same effect with just a couple keywords. So it really depends on your approach with Adwords.
WG
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I play with Google.
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