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It's not just for people who are attached, however. Some or looking for some short term NSA fun, while others are looking for an ongoing relationship with someone who can spoil them.
Basically, if you're looking to hook up, this is a good option. Here you avoid some of the BS on other dating sites, as everyone knows the game going in.
Also, the site is loaded with Meet Foreign Women for Dating or Marriage If you're looking to meet foreign women, whether for dating or for marriage, you should check out this introduction site.
Things have changed from the old "mail-order-bride" days, and now these are more like introduction services, and it's much easier to screen potential women with photos, chat, etc.