There isn't much more of a turn-off (for me) than talking to a somewhat attractive guy at a party who's about my age and hear him start a sentence with "So, when I was married...."
Perhaps I'm being too judgmental.
UPDATE: OK, for anyone who cares, I've reconsidered and decided that there are worse things a guy could mention. Like being 100% for the death penalty or thinking all women should be stay-at-home moms. You get the idea.