Chovy - I think its an awesome (maybe slightly pervy) thread. But great that you are open, honest and willing to talk about these things.
I think people take themselves far too seriously on the whole, and given that a large percentage of the population DO actually have sex at some stage...then this shouldnt be a wierd conversation!!!
For the record - no roaring as such in our house, but there are certainly distinctive sounds / phrases that are associated with it. 