Lelianna with her job as a bard probably has her fair share and she would be readily jumps in bed with Isabela for a four some.
I don't want to touch the mess that is DA2 where they want them to be sexually ambiguous, but then the bisexual erasure accusation being raised, so they change it to bisexual. Fenris was also written from the perspective of a gay character based on David Gaider's blog. That's why I said canonically bisexual characters.
Okay, one quick google search and I got this: http://dragonage.wik...ia_to_a_Fangirl
Quoting Xelestial here: Favorite part: Gaider wrote the Fenris romance with a male Hawke in mind! I am a F!Hawke/Anders, M!Hawke/Fenris girl so this was neat to me. The rivalry romance was the one he wrote first, and the one he prefers. He absolutely insisted on the whole slamming against the wall bit. Which, oh god, great judgment call. mmmf, hawt
He wrote a bisexual character with the male protag in mind. That's doesn't mean he's gay - it means that Garrett is the one Gaider pictured while writing the romance. I can't speak for Gaider, but I can speak as a writer. Dialogue doesn't just spontaneously appear on the page - you need to picture the characters, and hear their voices. And, for whatever reason, he pictured m!Hawke. That doesn't stop Fenris being attracted to women, or prevent him from being bisexual. You may as well say that rival route is more canon because he wrote that first.