Verified answer

pherramones. It just like other creatures/animals. The body gives off certain chemicals and scents and when two people are in that same mode, the attractions become unexplainable. Its happened to me a couple of times in the past. As long as you are open to the suggestion the pherramones give off, you are able to react to that energy. If you are in a comitted relationship, most of us can ignore the energy or at least not act upon it.

Yes many can. I can. But I can't tell you how I do, whether it be body language, voice tone, or what. But I know when I am feeling it as I tend to flirt more.