Why do you have little reliable data on human sexuality?

Reliable data on human sexuality is often limited due to factors such as societal stigma, cultural taboos, and the private nature of sexual behavior, which can lead to underreporting or biased responses in surveys. Additionally, the complexity of human sexuality, which encompasses a wide range of orientations, preferences, and experiences, makes it difficult to capture comprehensively. Ethical considerations in research can also restrict the types of studies conducted, further limiting available data.