Thank you for your speedy advice...which scares me a little, actually, but it's good to know. He does in fact use marijuana regularly, but excessively I wouldn't say that...incase that's the reason, is there anything to be worried about (well, other than the fact that he is using marijuana to begin with). When you say "sperm cells are completely absent", do you actually mean it doesn't contain any sperm cells? Is it harmful if I swallow it?