You are correct, it is grounds for one party to sue the other to get out of the marriage contract. There is no method for law enforcement to start the process.
You listed legal reasons one can person could back out of a marriage. Usually to stop the other party from gaining half of the others property.
Someone has to say they were injured.
My extreme idea was solely to keep the governments hands off of property you have already paid taxes on multiple times. If someone had the nads to pursue my strategy. I doubt one would sue the other for not having sex.
Also the father or son would know of the incapacitation at time of marriage.
Again, this is using the twisted lefts lack of morals,