I got introduced to shonen-ai through webcomics. There's some interesting stuff out there, and I really like the experience of reading webcomics - you can form a relationship with the author (especially on the less-read comics, which is what most of these were) and even make some connections in the business. I got my first and only published doujin oneshot printed in the back of the comic it was based on when the woman who drew the comic published it with an indie comic publisher.
Even the first shonen-ai I owned was a webcomic. It was the hard copy of the first story arc of
Honeydew Syndrome. After that I bought
Gravitation because it was the only shonen-ai the store had.
I was introduced to yaoi through doujinshi. The very first actual yaoi I ever read, for some strange reason, was the Narusasu dj [m]15-Sai Hakusho[/m]. But I honestly have no idea when I started reading every vaguely m/m thing that came my way...
The first shoujo-ai I ever read was
Oniisama e.... I avoided it for a long time despite it being by one of the most illustrious mangaka of all time (and a personal favorite) because of the stigma I had attached to the genre back then. I'm glad I changed my mind, because it's currently among my favorite series ever.
I can't remember what my first yuri manga was, but I'm pretty positive it was some lame oneshot translated by Lililicious.
Last edited by akari_mizunashi at 9:32 pm, Oct 25 2011
) before reading yaoi and it was 
