Gravitation
Gravitation was my very first anime yaoi. At first I couldn't get why they were both boys, or if one was cross-dressing! Anyways, after watching it I finally understood what was happening. Then I totally got hooked! My first manga yaoi was Junjou Romantica, and then it was Sekaiichi Hatsukoi, my absolute FAVORITE!
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Hehe my first anime was Gravitation too! I watched it in highschool, at the recommendation of a colleague. It seems strange, but I didn't got hooked then, but rather late, after finishing college. Strange now that I think about it...