Just a question, are you able to get aroused with a partner if you are a necrophiliac, or do you need to see images or imagine in order to do so?
Depends on how bad necro is hitting you.
Most guys are just into fantasy and are are able to experience love for alive partners, fuck regularly (with alive dudes!!!) and maintain healthy relationships.
A good majority though are unable to form such relationships and need to look at dead dudes on their computers in order to cum. Otherwise dudes are non-violent and can lead realtively normal lives.
Further up the scale esp with older dudes you can become housebound, no friends almost universally estranged from family.
At this stage some guys become paranoid, many believe the world is coming to an end, develop a feeling of dead and impending disaster, suicidal thoughts or you start thinking you are soon going to die or you have cancer.
And at the very top is the worst kind of necrophilia there is - those who turn itno predators and need to kill and main other humans in order to get sexually aroused. And not only. Cannibalism is common amoung gay necro serials.
These rare beasts are intelligent, manipulative, cunning and can use their looks to lure their victims (Dahmer, Luka Magnotta and many others did exactly that).
For me this last worst type of necrophilia is the hardest to understand, is it genes? Or something that happens in your childhood?