So your wife has died, and now she is marginally better in bed than before.
If you really want to get her to wiggle, simply add maggots.
Wife's Improved Bed Performance
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Explanation
Experiment
Explain Bear
Listen here, numbskull. This joke is saying that this guy is gettin' it on with his dead wife. But get this, she's still not good enough in bed! To spice things up, he adds maggots to make her wiggle. I can already tell you aren't getting any bitches.