I've been married less than 6 months, and we are paying off student loans together. In fact, I paid off half of them with 3/4 of what I had in savings 2 days after we got married. In our case, the job/income situation will change over the years as we have kids or face major changes (like right now-he's quitting his job without another lined up for the moment due to safety concerns). We are in it together. I always wonder how people w/ separate finances would handle one of them getting sick in the hospital for weeks or months of being unable to work. Also, I am planning to run my family's business, which will involved buying it, and my husband has to be totally on board with this for us to actually consider marriage. The the debt paydown is just one step of many large savings goals during our lifetimes. Also, my income will one day be highly variable because farm income off perennial crops (apple trees!) can have major swings and all comes at once, but if it's low I can't just go work a few extra hours to bring it up.
In addition, while we were dating and then more so when we were engaged I helped pay them down. I couldn't stand to watch that interest build at such a high rate on what feels like a large amount of loans. While we dated, I would send a $500 or $1,000 check in every few months to help keep the balance from growing. My now-husband got injured and in the hospital/recuperating for 6 weeks twice in one year, and didn't make any money at those times, so I helped him out. I thought it through, we were committed and I didn't' judge him to be irresponsible, and I decided I wouldn't miss the money later. (I also was increasing my net worth $15,000-$20,000 a year as college student with a small part-time job thanks to some stipends, scholarships, and relatives; so I wasn't carefully watching my budget either). Once we were engaged and living together, I put $1500/month of savings on the loans in addition to "our" regular double the minimum monthly payment. We lived on a joint budget at that time since it was 6 months to our wedding, and he had just moved 500 miles to live together.