I don't know what conversations you think might be off limits, other than strong sexual content and (divisive) politics.
SF has hosted many frank discussions about good, bad, sad, challenging, funny, frustrating, and delightful experiences with children, grandchildren, parents, significant others, neighbors, workmates, childhoods, finances, life, death, life after death, religion, spirituality, current events, retirement, health challenges, and numerous other topics that don't immediately spring to mind.
What were you hoping to discuss that you imagine would be flagged as inappropriate or of little interest?