WASHINGTON — The feds have asked a judge to strike from the public record the most “scandalous” details of a bombshell sexual-discrimination lawsuit against Janet Napolitano and the Department of Homeland Security that refer to oral sex and an odd bathroom prank.

The lewd details are included in senior law-enforcement official James Hayes’ suit claiming retaliation anti-guy bias.

The filing claims top immigration aide Suzanne Barr “humiliated” a male employee by calling him in his hotel room and screaming that she wanted his “c–k in the back of [her] throat.”

It also states that Barr, a close adviser to Homeland Security Secretary Napolitano, who went on leave this week after the suit appeared,, “rewarded those male employees who would play along with her sexually charged games.”

The pranks allegedly included moving three male employees’ office equipment, including computers and name plates, into a men’s bathroom.

Those details, says a government motion to dismiss the suit, “serve only as an attempt to embarrass or harass senior government officials” and therefore “should be stricken from the public record.”