Mostly Kaj said what I was gonna say.

In terms of detailed reactions... well, I could summarize the common thread as "If I were going to hook up with a guy it would probably be you, and I'm not unattracted, which is surprising, and, hey, sure, why not?" followed some time later by "Nah, straight."

I generally took it roughly in the same spirit that I make a point of tasting foods that I don't like when someone who does like it identifies a good example of it, just to see whether I still don't like it... because, hey, sometimes I discover that my tastes have changed while I wasn't looking.

That said, I far preferred the ones who were clear about that being their state. (In their defense, most of them were.)