Honestly, I do think that an explicitly gay character being made bisexual would be bad.
The thing is though, Kaidan and Anders do not really work in Kallen's hypothetical because they were never confirmed as straight to begin with.
Exactly. I don't remember of Steve actually identified as
gay or just interested in men. I've never played a female in ME3, so I don't know he turns her down. Samantha definitely identified as lesbian. However, if Steve didn't identify as
gay and was revealed to be bisexual, I'd be fine with it. I'd be disappointed because we've only ever had 5
gay and lesbian companions/LIs, but it wouldn't be a retcon in my mind.
I agree that it's not exactly the same thing when a minority group is on the receiving end as the majority group, but I don't think it's off limits.