My girlfriend is in an online forum and was asked if she enjoys anal sex and what sex position is her favourite.

I always thought she was very traditional and religious, because she also wants me to become more religious.

She then replied to these men and said that she a does not enjoy it and b does not know yet.

I am angered she replied to them.

Am I irrational guys?
Is she actually a slut and i am wrong?
What should I do?
Is she still marriage material?