To want to make her horny?

kiss her neck

I wouldn't say there are any guaranteed ways, but when you get into bed with her, ask her what sexual fantasies she has.

Try and be open-minded enough to fulfill them. If she decides she doesn't like what you're doing, you can at least say you tried, and that's all anyone can ask of you. :)

Meth

Identify as the universe.

No.