Key word there is "looks". Always ask people what benefit they get from marriage or a kid, but I just get vague crap so is hard to judge its merit
I can be very specific about the benefit of marriage, but this is a family friendly forum.
Financially I'd say it has been a boon for me, although that can vary pretty widely. Given that we make the same income though, it definitely helps to be able to combine our buying power.
Also a friend of mine ended up with this crazy bloody nose situation where he passed out at home, and his wife called the paramedics and dealt with it. Maybe he wouldn't have died from it, but it is crazy to think what would have happened. I guess you can get that same benefit from a conscientious roommate though.