Crabs and Crab Cakes

I was at this wedding where a member of the wedding party objected by saying that the soon-to-be-married couple had given her crabs during a three-way they had had.
And she wasn’t the only one. Almost the entire wedding party had gotten crabs from the bride and groom. They went on with the wedding and at the party, I kid you not, they served crab cakes.