You're a guy with loose curley hair you want to style it in the various ways that are possible with straight hair although you don't want to physically straighten it how do you go about it?

When your hair is wet, you can blow dry it straight by holding it taught. This will suppress the waves for a while.

Honestly you might just consider going to the haircut place and asking them to do hair straightener MILDLY on your hair. You can cut your hair short if you don't like the straightness, but you can see what you think.