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Sonnet 129
The expense of spirit in a waste of shame
Is lust in action; and till action, lust
Is perjured, murderous, bloody, full of blame,
Savage, extreme, rude, cruel, not to trust,
Enjoyíd no sooner but despised straight,
Past reason hunted, and no sooner had
Past reason hated, as a swallowíd bait
On purpose laid to make the taker mad;
Mad in pursuit and in possession so;
Had, having, and in quest to have, extreme;
A bliss in proof, and proved, a very woe;
Before, a joy proposed; behind, a dream.
All this the world well knows; yet none knows well
To shun the heaven that leads men to this hell.
Shakespreare's Sonnet 129 is about lust and sexual desire. It talks about the maddening corrupting powers of lust before/leading up to- the act of sex, calling it bloody, murderous, extreme and not to trust, and once the act is done, shame follows and the thought of the act is despised.
He speaks of lust as a bait laid to make the taker mad.
(presumably he means lust and consummation through dishonourable means)
Shakespeare is obviously writing from an older, more bible conscious time and it is reflected in the severity of his words, but the message still stands.