This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. On a horse or other animal with no saddle: rode bareback; a bareback rider.

ad. Without a saddle.

ad. Without a condom.

v. To have sex without a condom.

v. To have, usually male to male, anal sex without a condom.

ad. On the bare back of a horse, without using a saddle.

Using or performing on a barebacked horse: as, a bareback rider.

On a barebacked horse: as, to ride bareback.

adj. riding without a saddle

ad. without a saddle

"Some sites are used specifically to arrange unprotected - or "bareback" - encounters between groups of men."

unsaddled   

barebacking    barebacker   

barebacked   

gray-cloaked    dressage    ifthe    purple-clad    motorbike    black-armoured    gondale    highly-favoured    green-cloaked    watchdragon