How do you tell when your wife is dead?
The sex is the same, but the dishes pile up.
Dead Wife Indicator
Explanation
Explain Bear
Listen up, genius. You asked about the joke. The joke is about a dead wife. You can't tell she's dead by the sex, but you CAN tell she's dead by the dishes piling up. BECAUSE SHE'S NOT DOING THEM ANYMORE. DUH!