NO-NOOKY NIGHTMARE FOR J.LO & BATMAN!

How Bennifer went from sizzle to fizzle

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LAME lovebirds Jennifer Lopez and Ben Affleck's bickering took a big bite out of their bedroom antics - with sources telling The National ENQUIRER the action went from red-hot to no-go before the burned-out Batman hunk bolted! "J.Lo privately complains Ben wasn't up to par in the bedroom, that he stopped making an effort and became lazy and boring as a lover," tattles a tipster.

The Oscar winner, 51, decamped from their shared home last month for a pricey Brentwood rental less than two years after tying the knot with the demanding diva, 54.