If you marry a 16 year-old it is legal to have sex with her but if you take a picture of beer topless it is considered kiddy porn. Sorry bout rape is an ancient word and the recent attempts to redefine and usr the justifiable horror of rape in other situations because it pays out well in court and the press didn't justify it. If a16 is old enough to consent to sex with an 18 year old then the of the person she is having sex with does not alter her ability to consent. I know the law in the US disagrees with me but of the and almost all of history agree.