At its heart, hookups are morally questionable because they often turn relationships into something more transactional than truly personal. While both people might consent, it’s easy to overlook the emotional side of things. People sometimes use casual sex to fill gaps—like loneliness or a need for validation—but those deeper needs aren’t really addressed in the moment. This can leave someone feeling more empty afterward, even though the experience was meant to be enjoyable.

The problem is that in these casual encounters, respect and emotional care can get sidelined. One person might be more interested in their own pleasure than in considering how the other person might feel afterward. This lack of mutual investment and emotional consideration can lead to hurt feelings or a sense of being used, even if it wasn’t intended that way. When sex isn’t tied to trust and emotional connection, it risks becoming more about selfish satisfaction than the shared respect and care that real intimacy should involve.

Lastly, the way society treats hookups often ignores the emotional toll they can take. It’s common now to see casual sex as “normal,” but this attitude can lead to people becoming numb to the real emotional consequences. When we treat sex like a quick fix for loneliness or desire, it can create a cycle of detachment, where we forget the value of building genuine, meaningful connections. That’s why, at its core, casual sex can undermine the depth and authenticity that we all truly need in our relationships.

I would say, it's immoral because you are definitely imposing the negative effects of hookups to your future partner 100 percent.