I read most of this topic and found it entertaining enough to deliver my two cents:
I think both sides of the debate are incorrect in some capacity.
-I don't believe it's true that tickling or any sexual activity with someone of the same sex, in and of itself, makes that person something other than straight. Under that premise if two guys kiss, for example, they're automatically gay and there is nothing else to be said of it. That is inherently wrong.
-However, I also don't believe that it's simply one's own mental state. If someone who is factually gay, by definition, believes (or maybe tricks himself into thinking) he's straight, that gay person is actually straight which is an obvious contradiction.
I think it comes down to what you enjoy doing. Is tickling sexual to you? If you're on this site, that's pretty much a given. Do you enjoy sharing this sexual activity with someone of the same sex? If you enjoy it, and it's sexual in nature to you, you're probably something less than completely straight. I could have sex with a guy, but I wouldn't enjoy it and wouldn't be gay, even if the guy managed to temporarily stimulate me. I wouldn't enjoy the tickling from another guy either.
That's how I view it. If you disagree, you wrong!!! 🙂