Wolf-Dogging describes a sexual practice whereby the wolf-dogger mounts their sexual partner doggy style - this part of the procedure could be performed either vaginally or anally. At the moment of the dogger's climax they stick a finger, fingers, or other object into the throat of the dogee. This triggers a gag reflux in the dogee and the related spasmodic muscle contraction of anal and/or vaginal muscles lending itself to heightened sexual gratification by the dogger.
See also Wolf-Bagging

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