Uncle Poodle -- Getting Naked With Fiance ... For HIV Awareness

Uncle Poodle is lathering up his fiance in the shower for a good cause -- besides the obvious one.

Poodle is taking part in a new online campaign -- similar to the Ice Bucket Challenge -- only this requires you to take a selfie in the shower to help support those diagnosed with HIV.

The campaign is not-so-cleverly titled the "HIV Shower Selfie Challenge" ... and there's a big push for people to make the photo their profile pic on December 1st -- World AIDS Day.

Poodle is HIV positive ... but Alan is negative. They hope posting the pics online will spread awareness to fans of Honey Boo Boo.