Seriously? Might be difficult to explain, just as it's difficult to explain any other fetish (what else would you call bugchasing?) like rubber, or leather, or lycra or whatever. I'm neg myself, and I know that if I roll the dice often enough it's gonna come up snake eyes. I'm a big boy, I know and accept the risks etc, you all know the argument by now.
But I don't actively go out seeking poz guys, as I know some do. I just dig sex, pure and simple. Thats what gets me off.
Anyone care to take a stab at this?