Slipping on a red dress has always been the equivalent of wearing a push up bra ... it often means, "Hey, everybody! I'm feeling sexy and ready to get my flirt on!"

But guys might not be the only ones picking up on this signal.

A new study says that women pick up on your "single and ready to mingle" signals too. Only they take it as a huge threat.

So next time you pull on that sexy read v-neck, just know you're going to get a lot of attention from both sexes ... it's just that the women may be more apt to fight than flirt.