Nuclear attack? That's not fun, it leaves everything in ruins... let's say a Neutron bomb attack, it kills biological things but leaves most buildings and such inscathed (well, what wasn't hit directly..)
In that case, I'll say fuck you clothes. I'll also walk around, marking my territory (my way). I might try necrophilia out of boredom early on (It's not rape if it doesn't say "no!"). Eventually find (If I survived, who is to say others didn't?) a number of girls and eventually lord over my own Amazon tribe, with me as their single alpha male and I'll be worshipped as a god (I mean, I'm the one with the big gun).
What... Civilization died earlier, right?