Well, smut manhwa typically features themes and scenes of a sexual nature. It's not for everyone and is usually targeted at a mature audience. These comics can vary in their level of explicitness and storylines related to sexuality.
Common traits of harem manhwa smut include a male protagonist surrounded by several interested females and a lot of sensual and adult-oriented content. The plots can sometimes be light on story but heavy on the romance and intimate moments.
You can try some online comic platforms that specialize in adult content. But be aware that accessing such content may not be legal or ethical in some cases.
Another characteristic is a strong focus on the romantic relationship. It's not just about the sexual aspect. The characters usually have a deep emotional connection. In "Bared to You", the main characters' love for each other is as important as their physical relationship. They have to deal with their own insecurities and past traumas while being in love.
Another great one is 'Orange Marmalade'. It tells a story about a vampire girl trying to fit into a human school. It has elements of romance, drama, and the art is really beautiful. It also deals with themes of prejudice and acceptance in a very engaging way.