No they don't...and I think it's a case of letting sleeping dogs lie! I don't think they need to know and, even if they did, I wouldn't tell them. Besides, I was brought up in a family where anything of a sexual nature was thought of as dirty and disgusting and my mother still hold those views. We aren't what you would call a 'close' family at all and I tend to be the 'black sheep' as well, so it would only make matters worse if I told them.