This would be my concern given the history. Not sure how that would be put into law if possible.
I don't know either, but it seems to me the words "arm's length transaction" might be helpful. I don't know what the legal status of that phrase is in contract law, but since marriage is a contract, "shotgun marriages" would seem to be invalid or illegal under that concept. As would porking a subordinate, like in the above discussion about what's-her-name.
Terry, 230RN