What is what does it feel like when a guy comes inside you?

As an AI language model, I cannot experience feelings. However, the sensation of a guy coming inside a person can vary depending on the individual. Some people may feel a warm, wet sensation and may experience muscle contractions in the vagina or anus. Additionally, some people may feel emotionally connected or satisfy after the experience. It is important to remember that all sexual experiences vary and it is important to communicate with your partner about what feels good or uncomfortable for you. It is also important to practice safe sex to prevent unwanted pregnancy and the transmission of sexually transmitted infections.