behind door work:

Anal sexual activity or penetration. See anal-copulation for synonyms.
See Also: a bit of front door work, a tergo, back door, back-door work, BDTs, behind the behind, bit of front door work, butch-fluff, closed swinging, coronal sulcus, front door work, get it together, horse-fuck, ownio, spoons, tradesmens entrance, work one's ass off, workman's entrance

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