Amy Winehouse is reportedly treating husband Blake Fielder-Civil to sordid sex shows as he languishes behind bars.

Traumatised onlookers have described how the troubled singer spiced up a jail visit by pulling her top down, pressing her breasts against a glass booth and writhing suggestively.

A fellow visitor told The Sun, “It was not a pleasant sight. Amy seemed completely out of it.”

Blake is currently banged up in London's Pentonville prison, as he awaits sentencing on charges on perverting the course of justice.

It's claimed that he has been tiding himself over between his wife's visits by exchanging saucy letters with a female inmate.