Lyric discussion by Kiore 

I'm pretty sure this is a song about promiscuity. He can sleep around with whoever he pleases, free love, he can do what he wants when no one's around. Even when it starts to feel empty and repetitive (just meaningless sex) he keeps doing it because it's become a matter of pride, and he still acts like he loves it.

I think Kiore's basically got it. One thing I'll add is that it's not just about sex, it's about hedonism and lawlessness in general - sex ("we can take it inside"), theft ("yeah, we can take it \ good and loose on an endless spree"), drugs ("when I'm numb, natural one"), and whatever else might come over the singer during all this. Also a good dollop of nihilism ("the world is falling down, and it may as well crash with me").

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