Stigma is the act of revealing or teaching about the negative side effects which can become a result when a certain immoral behavior is practiced or entertained.

: a set of negative and often unfair beliefs that a society or group of people have about something

b : a mark of shame or discredit 
c : an identifying mark or characteristic; specifically : a specific diagnostic sign of a disease

botany : the top part in the center of a flower which receives the pollen


Also see the article called “social stigma”.