There seems to be a judgement that STIs are a morally worse form of illness to get than, say, a stomach bug caused by poor hygiene. We all indulge in 'risky behaviour' - having the odd drink, eating chips, even driving - far more likely to result in a fatality than unprotected sex. Yes, there are some behaviours that are riskier than others but that is about personal responsibility, not moral judgement. Makes no sense to me.