I would totally marry Sin and then if anyone said anything to me I'd say to them "Have you met my husband Sin?" Then Sin would crush them.
On our wedding I'd say "You sure are ugly. I mean I thought you were ugly before but I've never seen you up close before so.... Oh yeah and you do realise the only reason I'm marrying you is so that I can command your incredible strength and it would let me summon sinspawn whenever I wanted. Did I mention I thought you were ugly?"