As previously stated, by saying it here, people will know what you would do, so the judgment you would avoid ( as no one would know), can't be avoided if you state it here.
As for me, I'm a girl and I'm bissexual and I would gladly fuck myself.( all these years thinking of a twin sister...)
i would definately fight myself, the perfect opponent, one who knows each of my weaknesses, and all of my strengths, he would want the exact same thing too, as we most likeley would agree to it, now if it was a xy-xx clone(gender change), that'd be different, as we most likeley would agree to it, even if it was a paradox situation, my clone and i would fight, or fuck, to the point of both our deaths, pausing only to allow the other a moment to catch their breath, and would continue to do so for the rest of eternity (it sucks being immortal, life gets boring after the first hundred years)
I would fight myself. My reasons are for curiosity. I believe that I follow a set of morals in battle and want to know if I would follow them even in the heat of combat where my adrenaline will control my mind and I will enter a type of beast form. That's really the only reason.
That and I want to get stronger. What's better training than fighting yourself?
I'd fight myself, even though doing it with myself sounds like an interesting way to masturbate.
I'd beat the living daylights out of my clone because I always feel like beating the s*&% out of myself every single day, and what better way to do it than with my clone.
I would beat myself senseless using any blunt object within reach. I've done stupid things in life and I never had the gall nor the stones to truly punish myself. And with this opportunity, I can either clear my conscience. Or I can feel even more guilty if I end up killing myself, knowing for the rest of my life that I had murdered someone, even if that someone was me. It's all a matter of restraint in my case.
I'd definitely try to kick my own ass. Just the prospect of that is awesome. Like the OP said, completely evenly matched, and the only thing that would be ableto determine the winner would be who could strategize and anticipate better.
I would beat the shit out of my self. An oppurtunity to learn how strong I am what my weaknesses are and an opponent that knows when to stop and when pride is on the line sounds like the best hour of my life.
I've seen a couple "If it was a female clone" type answers, so I would pose the opposite scenario:
For girls, would you fuck a male clone of yourself? (I'm guessing yes)
And what if you were the genderbended one? would anyone fuck themselves if you yourself were suddenly a girl/boy?