My boyfriend conscious about poop!

Hey Reddit!My boyfriend is new to gay sex and has only had it one other time, he's 16 and is concious incase he happens to poop on me whilst we are having sex. We haven't yet had sex and this is one of his worried, being older I have much more experience and I have given him advice and told him its nothing to be worried about... It has happened to me both as a top and a bottom.What advice could the Reddit world give him to keep his mind at rest? I said 'You can't go looking for buried treasure and be suprised when you find it ;).Thanks guys!