What makes someone "bang-able"?

Okay guys... I've heard this term used once, but it's played on my mind since. What makes someone "bang-able"?

Is it confidence? Is it the physical appearance?

What makes someone "bang-able"?

I know it sounds like a weird question, but I'm curious and it might answer a question I have playing on my mind.
What makes someone "bang-able"?
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