Maybe it's just me. To me, Kakashi reading porn = more sexually open, so I could kind of see him as being the "I'll try anything once" kind of person. Or maybe he was really drunk.

Hmmmm... I see where you're coming from. For me, I picture Icha, Icha as much more traditionally romancy-novely, only with lots of sex, so rather strongly heternormative.

But a lot of that is just subjective and my guesses based on how the characters 'vibe' for me.

Honestly, I can see Jiraiya having doing a guy easier than Kakashi.