Certain societies have historically been known for their liberal views on sexuality and have integrated different sexual practices into their cultural and social norms. Private societies, by their nature, tend to operate under their own set of rules and norms, which may not always align with public or mainstream standards. When we examine sexual practices within specific societal contexts, then we see this topic delve into human behavior. Discussing whether certain practices are accepted or considered normal can vary significantly. A good example of that topic being addressed would be through academic or anthropological studies. If you have a specific aspect of this topic you'd like to explore further, feel free to ask.