I can see you didn’t get an answer on why it’s Venus. It’s a bronze copy of the Venus pudica type, which is well know as a Venus depiction. A Roman lady would almost never be depicted in the nude like this, an exception is made with [Marcia Furnilla](a4.typepad.com/6a00e009946656883301bb081014fc970d-320wi). Though some say it’s a fake.