I was thinking the same thing and was reading about it online, as much as I could stomach. It has been the motivation for quite a few sk's.
Overview on Necrophilia
Cause and prevalance
Virtually no research has been conducted regarding the prevalance of necrophilic attraction among humans. Klaf and Brown and William Brown in their "Necrophilia: Brief Review and Case Report," refer that, although rarely described, necrophilic fantasies may occur more often than is generally supposed.
Rosman and Resnick (1989). "Sexual attraction to corpses: a psychiatric review of necrophilia," theorized that either of the following situations could be antecedents to necrophilia (pp. 161):
The necrophile develops poor self-esteem, perhaps due in part to a significant loss;
(a) He (usually male) is very fearful of rejection by women and he desires a sexual object who is incapable of rejecting him; and/or
(b) He is fearful of the dead, and transforms his fear of the deadby means of reaction formationinto a desire for the dead.
He develops an exciting fantasy of sex with a corpse, sometimes after exposure to a corpse.</blockquote>
The authors also reported that, of their sample of 'necrophiliacs,'
68% were motivated by a desire for an unresisting and unrejecting partner; 21% by a want for reunion with a lost partner; 15% by sexual attraction to corpses; 15% by a desire for comfort or to overcome feelings of isolation; and 12% by a desire to remedy low self-esteem by expressing power over a corpse (pp. 159). (It could be surmised that only the 15% motivated by an attraction to corpses were true necrophiliacs.)
Read more:
http://www.monstropedia.org/index.php?title=Necrophilia#ixzz22N3mX6eI