Outer limits

I've been thinking, not about what I do write about, but what I won't. I'm not talking about purposeful limitations set by my publisher or myself--I've used the f-bomb one time in 15 books and still wonder if I could have avoided it; it's just not my thing--but about things that I won't go to. In no certain order, I won't write about:
The death of a protagonist's child, either on or off the page, because I don't think I could represent the depth of that agony and to either underplay or stick p...