Obviously not all women are like this, thank God, but I've come across a fair few who act like this...
Why behave like this?
Do what you want, sleep with whomever you want, but nothing cancels my right to an opinion.
Women who sleep around, play with feelings, and are rpoud of calling themselves biches and sluts AREN'T long-term material, for me and for many, many men out there. So don't go complaining if no one takes you seriously.