Maturity helps. When people are younger, having them be 'potty words' made them that much more interesting to kids. Adults have no limits on what they can say and by then have matured and no longer find it funny. Jokes passed down from kid to kid have also increased the immaturity towards these subjects. Hope this helps!
Hi Ursula28, Everyone has a different tolerance level for what they consider to be inappropriate, it is very subjective. There are many things that can influence a person's opinion on what is inappropriate too including age, religion, region of the country they were raised in and even what country they are raised in, right down to your parent's influence. So perhaps the people who are offending you with inappropriate conversations don't feel they are inappropriate?