It's always best to err on the side of caution putting in SEO isn't going to penalize you and can only help you.

Just dont do the typical laundry list of meta keywords that I see often. Use phrases, Cap the first letter of each word, sort longest phrase to shortest and alphabetical.

There are a lot of search engines out there that still use meta keywords and Google looks at them even if they don't have as much weight as before.

I see soo many adult sites with ZERO SEO that could be doing better if they at least did the basics