1)What intrigued you about the genre at first?
Curiousity. Without reading or having a few titles recommended, I woudn't have known what I've missed out on.
2)How was yaoi first introduced to you?
Well actually, I was first introduced to Shonen Ai. Eerie Queerie was my first title because a couple of girls recommended it at Waldenbooks. I didn't know what it was, until I read the book and saw an article about Fake in Anime Insider (May not be the name. It's the one released by Wizard.). Since I enjoyed reading Fake, my next step was to watch the Descendants of Darkness Test Drive. Although not a true yaoi, it introduced me to others.
From there, I picked up my first true yaoi- Skyscrapers of Oz. Wasn't the best, but the sex scenes were pretty intense. I enjoyed the feeling, so I became hooked. (All mental, nothing else when it comes to the feeling)
3)And most importantly, your favourite yaoi mangas and anime.
Whew, I am still a bit green. My yaoi collection is only SoZ, one volume of Level C, two volumes of Junjo Romantica, and recently, Mimi Paradise scans. I've seen Level C, but hope to watch other titles when I have the time and money. I'm seriously addicted, but those are two things I am short on. I just need to find some titles, then I will be glad to explore the genre.