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I won't invite my second cousin's fling.When you're putting your list together, a spirit of irrationally warm hospitality might take over, making you inclined to invite all of your single guests' guys/girls-of-the-moment. We know you're thinking: "What if they get married one day? I'll feel terrible if my cousin by marriage wasn't at our wedding." But remember, aside from the (big) expense of inviting every single person with a date, you don't want to celebrate the most important event of your life thus far with a bunch of people you'll likely never see again. Trust us, if you invite cousin Bill's arm candy, she'll somehow wind up front and center in half of the photographs, but he'll dump her before you return from your honeymoon, and you won't remember her name in a year. So make a rule about plus ones (maybe it's "only couples who've been dating for more than a year" or "only members of the wedding party get to invite random dates") and stick to it."
From: 10 Wedding Planning Rules For Every Bride http://wedding.theknot.com/wedding-planning/planning-a-wedding/articles/10-wedding-planning-rules-for-every-bride.aspx?page=2#ixzz2lHbLkQsW"
Seriously? You can't judge people's relationships based on how long they have been going out. If two people identify themselves as couple, they should be invited together, period. Thoughts?