Adult products that are hot and controversial on the Internet include the following categories: 1. **Adult toys**: Such as various types of vibrators, simulators, sex toys, etc., these products often cause discussion and controversy due to their nature and use. 2. **Sexy lingerie**: Lingerie with bold and sexy designs, although loved by many people, also caused controversy due to gender stereotypes and objectification of women. 3. **Sexy skin care products**: Such as lubricants, sex oils, etc., these products often attract attention and discussion in terms of use and ingredients. 4. **Virtual reality (VR) adult content**: This emerging content form uses virtual reality technology to provide an immersive experience, but also raises concerns about ethics and mental health. 5. **Adult subscription services**: For example, some subscription platforms that focus on adult content have caused varying degrees of controversy in different cultures and regions due to the sensitivity of their content. 6. **Emotional companion robots**: Although such products are regarded as technological advancements, they also face moral and ethical doubts. The popularity of these products is closely related to society's open attitude towards sex, the development of science and technology, and the degree of acceptance in different cultural backgrounds, but it has also triggered debates on many aspects such as morality, ethics, safety and mental health.