You can be as specific as you want, but remember: if your search is too narrow you’ll end up with less than you want. For example, if you pick just "slender" for your Body Type, and an advertiser said he/she was “petite,” “skinny,” and “wiry” (but didn’t check “slender’), that person won’t show up in your search results. Moral: unless you really care about a single characteristic, accept the “No Preference” default or pick all that might be acceptable to you.