if you want to dream about a person just think about that person while falling asleep and there is a high chance that that person will appear in your dream and no you don't have to be lucid to dream about that person but i guess it would be better for you then you would have "control" of your dream and it's always good to know that your dreaming.

what i want to know is why you want to dream about this person when this person exists in real life.. i'm assuming this is the guy with the cowboy hat right? well if he exists in your dream and you really want to get with him then why not do so in real life because dreams can only go so far.

let's say for a second that you do get this guy to appear in your dream and you are lucid at the time and so you do whatever you wish with this guy (sexual or not) i mean what's left? it was all a dream and that's it you wake up!

so instead go for the real deal .. why try to do something in a dream when you have the real person in your life.