Women who call other women degrading slurs like whore and slut are participating in the oppression of all women-kind. There are no words for men that are equivalent. Why do you want to participate in degradation like that? IMO, such behavior is a far worse trait than a woman who participates in sexual activiity (which is really none of your business). Really, with a friend like you, who needs an enemy?
I'll tell you the same thing I tell my 15 year old daughter and her friends: mind your own sex life. And stop...just STOP...degrading other women. Practice being pro-woman. You really will need other women who are pro-woman in your life.