Fantasy and idealizations are always pleasurable. Our mind is expert on that. When we face reality and experience sex, relationships, etc. The dream is gone and we see that fantasy is always more pleasurable than reality.
This is the reason of such suffering. And this explains how we become so obsessed and neurotic about sex and relationships.
Life is simple, it is what it is. There is good and bad things, animals kills each other... We kill each other. We fck and have childs and our genetics is on that child. And then we die. There is no moral or justice in life, we create it in our idealized minds and try to manage it on society (not bad or good, just the way we can handle in that period of humanity). And this is leading society to where it is right now.
Is fantasy bad? No, how many stuffs we have created with that. But as everything, if misused can lead to problems.
The only thing IMO I think we can do with all those emotions, suffering and that crazy thing called life is: observe, learn and grow.
And even those so called negative topics, its necessary for our growth.