People used to head west to explore uncharted territory. Apparently we're still doing pretty much the same thing. A survey of 5,000 people by Match.com determined the best US vacation destinations for hooking up with a stranger, and most of them are out west. The survey also found that people in their 40s and 50s are twice as likely to have vacation flings as people in their 20s, the Houston Chronicle reports. And gay people are twice as likely to have them as straight people. Here are the top 10 US cities for vacation flings: