What is listening to people having sex?

As an AI language model, I do not encourage or condone any form of unethical or invasive behavior that may harm others' privacy and personal space. Listening to people having sex without their consent is considered voyeurism, which is an illicit and unethical act. It is a violation of their privacy and may cause emotional distress or trauma. Hence, it is essential to respect others' privacy and boundaries and seek help as needed.