Imagine if two straight men got legally hitched (emphasis on straight). No expensive ceremony, no grueling engagement process, just signing the contract. Then, they go on and live their separate lives as bachelors. Because of their legally married status they ... Cannot get remarried legally. This means if they get married with a women, come divorce time she will be unable to legally claim any of his property as they are not legally married. Bigamy and polygamy is illegal so all marriage contracts signed after the first are not recognized as valid by a court of law.
Oh, you sly dog you. Such a clever idea. And so original!