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you definitely don't need it in the domain name. you're way better off if the domain name is something brandable that people can remember and type in later.
As far as I know, google doesn't care much about the description, it's only for describing your page on the SERP. so, write it for humans, not for google--you want it to drive clicks, which should help your SEO.
Put the keyword in the page title, and perhaps in a header (h1 or css-styled larger). It should also naturally appear a few other places on your page, too--for example, if you're targeting "teen", some of the video titles would probably have "teen" in them. Or the categories list would include "Teen anal", "Teen blowjob", "Amateur teen"....variations on "teen".
If it's a competitive keyword you would need to get some contextual backlinks for it. read about cocitation/co-occurence.
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