I have taught many workshops. I have had students who will show their poem in a workshop but would never show their mother, or show their friends. You might write about a sexual experience you have had, but you cannot show your mom that. Moms do not want to know about that. For me, as long as it is in good taste.
Taste is very personal.
It is coloured by our environment, by our society, by our culture, and by our peers. I think that we become less afraid the older we get. I think that for high school students and for young people in university it is difficult and frightening. If you are living with your boyfriend or your girlfriend and you write about a girl. It's about you.