Lately I've been feeling the need to point out my roommates promiscuous behavior.
What makes you feel the need the point that out? It kinda seems like none of your business.
Because she doesn't stop when I ask her to.
When girls are bullied based on their sexuality, this is called slut-shaming. You should support your roommate's lifestyle and make sure she feels okay with herself.
Are you saying that she shouldn't listen to me and shouldn't listen to my advice?
I'm saying she is her own person and has the free will to do whatever she likes. I don't think it's worth your time and effort to try to butt into her personal life.