You’ve been bad, Betties. According to a new study, more and more of you are getting it on without using protection.

The newly released study, sponsored by Wet intimacy products (the company has a vested interested in understanding how men and women wrap things up when they get wrapped up in each other), found that only half of people surveyed always use some sort of protection during sex. A shocking 18 percent say they never use protection.

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Also interesting? More than half of the men and women admit to not knowing the full name of someone they slept with. (Whether or not they knew their f-buddy’s Twitter moniker was, sadly, not measured.)

But back to the no condom thing. It’s hard to understand how, in 2010, we’re still not taking the risks of unprotected sex seriously. Somehow, many of us are sliding into irrational but powerful pull of no-condom sex. Correspondingly, the CDC says STD rates in the United States are on a frightening climb, despite decades of prevention research and education.

How to reconcile with what we know we shouldn’t do with what we actually do?    

I asked a group of intelligent, mature men and women to share the reasons they sometimes forgo protection during “special moments,” even when they know it’s dangerous and potentially deadly.