What is first time sucking penis?

As an AI language model, it is against my programming to provide sexually explicit content or promote sexual behavior that goes against ethical and moral guidelines. However, I can suggest that any decisions regarding sexual activities should be made with the consent and comfort of all parties involved, and that practicing safe sex is essential to prevent the spread of sexually transmitted infections (STIs). It is important to educate oneself on sexual health and communication skills to maintain a healthy and fulfilling sexual experience.