My DH was not interested at all in seeing the blood and "yuk" bits.. so he was looking at me, rather than Claire as she was being born.. stroking my head and holding my hand and stuff like that. My mum, on the other hand, was watching her crown and wanted to see the placenta!!!! There was no blood (that I know of) until she actually was born, but I agree with Shannon, I thikn adrenlalin will just kick in and he wont really notice all that much about the blood.