How to get him
Entice him with food. Either that or trick him. (And while I'll agree that having the whole plan hinge on a childhood promise and a martial arts tournament did the trick for Chichi; may I just say that going to all that trouble was hardly necessary? All you have to do is bedazzle him with a bright shiny object).

Competition
Assorted dinosaurs and their eggs, bad guys reincarnated as amazingly strong little boys, belligenrent aliens and/or androids appearing seemingly out of nowhere, Kaio Sama, and last but not least, his homies.

He likes you if...
Well, if he gets you pregnant a couple of times, that shows you've gain a toehold into his little attention span. Yay. (May I just stress the words "LITTLE attention span"?).