Our mother lives alone in the house where my sister and I grow up. She's married and lives three blocks away and I live next door with my girlfriend. We both have a key to our mother's house, to use in case of emergency but we use it for a lot more. In the basement there's a small laudry room where my sister and I discovered sex when we were both teenagers and even after all this time we still like to use it, at least once a week.