It's much easier for a great looking man or woman to find continuous streams of narcissistic supply via adulation and romantic pursuit from others, and until this by inflicting physical harm to anyone who's close--which can include their child or partner.
They are lacking in empathy and impulse control, which allows these violent acts to happen, and our prison system houses many Borderlines who've In the midst of mending from these intoxicating but dangerous relationships, hundreds of men have described a terrifying "demonic" influence that appears to inhabit their beloved when she's confronted with her lying, manipulations and betrayals--or some sort of (minor) infraction on their part, has catalyzed the most horrifying change in her facial expression.
Self-harm and suicidal behavior are common and may require inpatient psychiatric care.
Tragically in many cases the victim will believe that they are in fact damaged, incapable, no good and defective. Such feelings are the result of a severely diminished sense of identity and a battered self-esteem.
Many people who are narcissistically abused suffer profound depression and even severe physical deterioration.
Recent research suggests that the disorder, which afflicts 2% of the population, is linked to hormone levels and can be exacerbated by hormonal treatment such as birth control.
From Wikipedia: Borderline personality disorder (BPD) is a personality disorder characterized by unusual variability and depth of moods.