So I just started a blog with a bunch of sub categories which means lots and lots of keywords that I can use.

When I'm using keywords in my text, is there a point where I can use too many different keywords?

To clarify, I'm not talking about keyword density. I'm compiling a list of keywords that I think goes along with my niche/blog that has traffic on the engines.

Is there a point where I use too many different keyword (phrases) that will decrease my ranking on google for certain terms?

For example, i'm doing a porn blog, if I have a large set of relevant keywords for straight, anal, orgy, and etc.

And use them for each category. Will google penalize/dilute my site so that I will get lower ranking? for main and sub pages?