Rule 4: Don't discuss other men with the man you are with. When you are serious in your flirting, be sure to make the man you are with the center of all your attention. I suppose that works both ways, and the same applies for women too. Even if you don't intend it someone may feel "compared." We humans are fragile things, especially when falling in love.
Here's my song for today. . .
On and on the rain will fall
Like tears from a star like tears from a star
On and on the rain will say
How fragile we are how fragile we are
-- Sting from the song "Fragile"