To me, your question seems to be asking not so much whether m/m tickling is wrong, but whether it is gay or would make you gay.
There was a TMF Radio show where this issue was discussed a long while ago. I could not have disagreed more strongly with the host who suggested that f/f tickling is never gay because women are more loving, nurturing and intimate than men by nature and that they could make out, fondle each other's breasts, heck even fuck each other, without that even raising an eyebrow as to whether they might be gay. On the other hand, men could not go so far as holding hands or hugging without that being perceived as potentially gay. I found this too ridiculous to be believed but it does belie a double standard regarding male and female sexuality in this society.
My feeling on the matter is that tickling CAN be sexual depending on the circumstances. If one or both of the participants are attracted to each other, if its expected to be a prelude to sexual exploration later, etc... But to me, in a vacuum there is no reason why two friends, of any gender, cannot tickle other without it becoming sexual.
Like I said above, part of the problem associated with m/m tickling is the social stigma. The other problem that a straight, curious guy such as you has with m/m that a straight curious woman who wants f/f does not have, is the obvious indication that someone is getting turned on. Two clothed women might possibly get turned on by tickling but it isn't as obvious as a guy that gets a hard-on. And I think this possibility that the other guy or they themselves might get a hard-on, is the real reason most guys won't allow themselves to consider participating in m/m tickling.
Is there anything wrong with m/m, no. It's still just tickling. If none of the issues I mentioned above are a big deal to you, or you are just curious to try it out, definitely go ahead. Doesn't change who you are or your sexuality in the slightest. If you are comfortable with yourself, go for it.