There may be some members who don't find everything relating to sexual and gender discussions a trigger. There may be some things that trigger them and since none of us knows what triggers another, I think it's easy enough for us to put a trigger icon on our thread/post. Better to be safe and than sorry. This will at least give a member the idea that something may be triggering in the post/thread and it's up to them whether or not to take a chance on reading it.

Also, our Community Guidelines ask members to use the trigger icon when discussing something that "may" be triggering to others. The guideline does not specify which forums to use it in or not have to use it in.