consent in sexual morality. If we ask a question like, "Do you want to have sex?" then we have already assumed the price might be affordable. If that sounds degrading it is because it is.
People are complex. Sex goes deep into a person's psyche. So a question about sex can be very hard to answer. Sexual confusion is the rule and not the exception for people. There is a lot to think about. Short term sexual pleasure is always on people's minds. Then there is the effect on the relationship in question. Who else will find out? How will they react? How well do I really know this person?
We can think of a thousand things to think about but we very likely miss the most important ones. Sexuality goes deep into our heart and soul. We don't tend to grasp that well. We get that sexual abuse can hurt people in profound ways, but what is sexual abuse exactly? We can see that people who are under a certain age can't really give consent. But is age the thing? Isn't some level of self-awareness more important? When do we get there? How do we know?
You start to grasp that most people are quite ignorant of their own psycho-sexual situation. They are almost always ignorant of the sexual situation of the person they are hoping to have sex with. Mostly they don't care. People try and be nice and respectful and all that but they reach their limit pretty quickly. They want what they want. They don't want to deal with long term confusion. They pretend to respect you as a person but not fully, not when life get complicated. They want a girlfriend or boyfriend or maybe just a short term sex partner. What they don't want is an endless spritual mystery that will take a lifetime to contemplate. But that is what a human being is.
All the ways to try and fix consent fail miserably. They just don't take into account the nature of sex. Ultimately it is just another way of putting pressure on people. To make people feel like they have to consent to some sex just to be normal. The truth is that normal people are worth a lot more than society imagines. People talk about a rape culture but they don't get that the whole dating scene is about manufacturing consent. They talk passionately about the evils of explicit coercion but think somehow a system of implicit coercion is the answer.
This is where you see the wisdom of the Catholic idea of saving sex for marriage. Premarital sex risks all sorts of pain to achieve some very superficial pleasures. Then you add to that the benefits of celibacy. It is really the only rational choice. Marriage is the only place where men and women can embrace sex in all its facets and complexity and depth. You don't have to ask the price because you will pay anything and happily so.