That's the finding of a government survey released Thursday.
The results are a marked change from 1995, when only 34 per cent said they moved in together. Now it's 48 per cent. Back then, 39 per cent said they married first, compared to 23 now.
Experts say the numbers show living together is increasingly used as a testing ground for marriage. About 40 per cent of the women who lived with a guy went on to marry him within 3 years.
The survey by the federal Centers for Disease Control and Prevention questioned more than 12,000 women younger than 45 from 2006 to 2010.