Hmm, I guess I could understand the 10% bit, but I never saw it that way. In as much as I didn't read that scene as saying here is the moment Ianto realises he's bi. Mainly because I think Ianto's far too secure in himself as a person to be clueless about his own leanings. He knows what he wants, he's prepared to do whatever to get it, he's clever and incredibly confident and all of that, personalitywise, for me doesn't really fit with a guy who at the same time has no clue that he's bisexual. I realise my "Ianto's a big dominant alpha male" opinions may be clouding my judgement on that one, but no, I don't think Ianto didn't know he was bi when he set out to seduce Jack.

I think he was prepared to whore himself out for Lisa, but he wasn't prepared to enjoy it, yeah. I think the fact that he enjoyed it therefore freaked him out but I don't think the fact that Jack is a guy as opposed to a girl made that fact any better or worse for him.