Two or more people using the same [[artificial vagina|onahole]] at the same time for [[masturbation]]. 

Usually two people are either inserting into separate ends or the same end of the shared onahole. Due to [[penises touching]], this act can also probably be considered [[mutual masturbation]]. When inserting from different ends [[urethral insertion]] can be involved (though images of this are rare).

h4. See Also
* [[shared object insertion]]
* [[shared condom]]
shared artificial vagina