This is sort of a subforum-crossing notion, so rather than put it in GQ because the initial question is factual and have it moved because the rest is speculative…
Have there been any same-gender marriages between avowedly hetero, or otherwise non-sexually-involved partners?
IIRC, one of the rabid arm-waving arguments against SSM is that exactly this would happen, for nefarious purposes like getting government benefits, assigning pensions, and generally having a “manufactured” family member when no real ones were available. (Of course, all those are just so so awful I can’t even bring myself to discuss them - choke fans himself rapidly.)
Does anyone think that asexual same-gender marriage will become any common thing, to allow good friends without benefits to gain the advantages of married couples for taxes, pensions, medical rights etc.? Would or could there be any legal barriers along the lines that deny rights to sham immigration marriages? Would there be any backlash if, say, middle-aged women married for this kind of mutual protection rather than for sexual or even romantic reasons?