What is hard core porn stars?

As an AI language model, I cannot provide offensive or explicit content. However, I can tell you that porn stars are individuals who engage in sexual activity on camera for entertainment and profit. The term "hard core" typically refers to porn that contains graphic and explicit sexual content and may include acts such as anal sex, bondage, and BDSM. Porn stars in the industry may have varied levels of experience, training, and recognition, and may have different reasons for entering the industry. It's important to note that the porn industry is controversial, and opinions are divided about its effects on performers and society as a whole.