An Oklahoma threesome is in reference to the legal allowance by Oklahoma for first cousins to marry and procreate. However, this sex move has a couple requirements. First of all it involves having sex with a pregnant woman. Second, this woman must be either related to you, or your wife. Thereby, having sex with this woman you are also involving a third member of your blood family in a sexual exploit of yours. Thus, you are engaging in incest with not only one, but two members of your family.
I done got my ma's sister's daughter knocked up a few months back, but she reckons she wanted twins. So I told her a quick Oklahoma Threesome should do the trick and we'll jus' get another lit'l bugger up 'n growing inside her right quick.
by Lumberjackass June 27, 2012

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