housemate constantly bringing back guys

I share with two guy's and pretty quickly I found out that the floor's and wall's are pretty thin and also my bed sound's horrendous
I felt so bad after a while having anyone over and I even avoided bringing him back or even going to his. I spoke to my mate's about it and they said I had every right to have my boyf over as I pay rent also and it wasn't my fault I have an active sex life...
now I don't feel so bad as recently my roomate has a really loud girlfriend who he has over every sunday night! So I just make it a point to be out!
Talk to her and don't let her try to move you out! No one should get away with that kind of behavior