Well, it's true. People have non-romantic sex all the time. It's part of life and I suggest you get used to it. 
Doesn't mean I'm not allowed to express my dislike of the way the world works. Especially on the BSN where that is one of the more common topics.
But if both persons want it, why is it a problem?
Because that's not what sex should be about. Regardless of things like beliefs, sex is an act that shows that you are willing to give all of yourself to the other person since you are developing an intimate bond that is only beaten by a mother and child.
Okay, fair enough. Obv I disagree with you on what casual sex means, which is cool I am not gonna deny you your perspective, but the way you phrased it made me think you were worried for your people, not that you disapproved of it overall, I think.
I am worried for my people, but I also disapprove of it overall. I discussed my perspective in another thread, but would rather not bring it back up since I don't feel like being personally insulted again for having a different opinion on something.
Sex is an action. Actions can be done with a variety of emotions attached. It can be an expression of love, power, respect, vengeance, sympathy and more and whilst some may be more 'healthy' than others the opinion that sex should always take place in a framework of love is simply that- an opinion. It certainly doesn't make you wrong, but it shouldn't be a problem if people voluntarily have sex for reasons other than love of their partner(s) as long as both are consenting.
True, but some actions are meant to be only with a few emotions. For example saying "I'm going to be mean to you because I love you", it just doesn't work. Some people do it for those reasons, but it doesn't make sense. Likewise, you gave vengeance or power as reasons for having sex. Those two should have nothing to do with that act. The latter is often the reason for what society deems very serious crimes.
Which has nothing to do with IB having casual sex with other people, with consent on both sides
That reply was to someone saying The Iron Bull respects his non-Qun partners, when his very culture goes against that notion.