Posted 17 November 2012 - 09:58 PM
Sex itself is not a rude word. I would just explain what it meant (assuming that they didn't yet know) and move along. I have had to explain lots of things that my children have heard at school and take it all as a learning opportunity (Taliban, gay, refugees, war, suicide bombers, multiple swear words, and yes, sexy and hot, etc). At no point have I felt the need to involve a teacher.
DS is 7, so a similar age to yours.