Lyric discussion by Shades 

Yes, you're right, "Pretty girls make graves" is a quote from the Dharma Bums. In the book, the philosophy behind it is that "pretty girls" lead to lust, which in turn leads to birth, which in turn leads to suffering and then, inevitably, death, or "graves".

Based on this, the character sees celibacy as the only way of breaking the cycle, if you like. Therefore, I don't think the trick that nature played is that the narrator is gay, as some people have said. I think the trick Morrissey is reffering to is actually lust, something which seems to lead to pleasure, but is actually the cause of all suffering.

I think the "trick" is impotence.

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