If you have sex with your boyfriend, does it ruins the chance of him marrying you?

I've often heard the saying ''Why buy the cow when you can get the milk for free'' but how true is that?

If the saying is true, this has me confused. My parents had sex (right on the 2nd month) in their relationship and so did a couple other relatives but they still got married. If they didn't wait till marriage, how did the guy still married them? In comparing to now, it's like having sex even with a boyfriend ruins everything. He can be dating her for many years and wasting her years into nothing.
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If you have sex with your boyfriend, does it ruins the chance of him marrying you?
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