Heero and Duo (1 x 2) are the most popular pairing from the Gundam Wing series and this is, no doubt, due to the polar personalities of the two pilots. Well, they do say that opposites attract!
Want an idea of just how much attention the creators of the series were paying to yaiodom, and how serious they were about obtaining and maintaining that audience? Then take a look at this official advertisement for "Endless Waltz".
If you'd like to read more about yaoi within the Gundam world, then follow this link to a very well written Q&A.
