Insertion of 4 items into an orifice or receptacle. The items inserted are generally, but not limited to, male genitals.
For when DP just isn't enough.
The wife and I are going to push the boundaries today. We're trying for quad penetration...
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Noun: Penetration involving more than three and less than five dildonic objects, generally dildos, or in the classic western form, dildi.
Last night Jill had some crazy quad-dildonic penetration
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