Kink should make life more interesting and an essential part of participating in any kink is discussion of and respect for safety, limitations and boundaries. Dysmorphia is beyond kink and is a mental illness. Chapman died as a result of his mental illness being manipulated and fostered by other(s) without regards to his safety.
As Dan Savage said in regards to Small Penis Humiliation: So long as he isn't contemplating some dangerous or stupid way to make his cock bigger (like getting liquid silicone injected into his genitals, something that led to the death of a gay man in Seattle last year), you can engage in SPH without doing him harm.
In the latest news: Daddy Hafertepen and others in his harem have been sued by Chapman's mom for wrongful death, negligence, intentional infliction of emotional distress, and civil conspiracy. She seeks punitive damages and a ruling that his will was illegally revised to make Haftertepen sole beneficiary.