Assuming you're an adult what business is it of theres to be telling you what you should or shouldn't be doing at your age? Impotence is a problem for many people and is nothing to be ashamed of. Even if that wasn't the entire reason you were using this tool why at your age should you not be able to have an enjoyable sex life? I would sit down with your father and explain that as an adult you have needs and that this is just a tool to help you satisfy these needs - he has absolutely no right to talk to others about your private business. To be perfectly honest if your parents were so ashamed etc why would they go around telling anyone? If however this is still their intention i don't think they are worth the time worrying about anyway - you have your own problems and own life to get on with, if they can't accept you for who you are i wouldn't pay their thoughts/behaviour any notice.