Yes, I am. The person asked about our personal experiences and that is what I gave them. The question was 'does caffeine affect sexual functioning". In my man's case, the answer is no. Other men may have that problem, though. Men who probably already have ED. Christ, what have you people got against medical students anyway? You're a nurse, we're in(going into) the same career field. Why the crucification? Do I have to be a medical text book on every single thread or can I not just answer like a normal person and give my experiences? Like you said, "it can restrict". That does not mean that every man will get erectile problems from drinking a red bull or two. If someone wants to know something in depth, then I will further explain it. Otherwise, I will use layman's terms and speak of personal experience. We are not in the health and well being section so I would expect to not have to answer all questions medically. And why would any sane person lie about what they go to college for? If someone comes here and says that they are a rocket scientist then I will believe them until they disprove it.