Try to avoid living together before marriage.

That seems like really dangerous advice to me. The article confirms my suspicion:

"We think that some couples who move in together without a clear commitment to marriage may wind up sliding into marriage partly because they are already cohabiting," Rhoades says. "It seems wise to talk about commitment and what living together might mean for the future of the relationship before moving in together, especially because cohabiting likely makes it harder to break up compared to dating."

The solution is not to avoid living together before marriage; the solution is to break up when you know you should.