Biastophilia (or raptophilia, also paraphilic rape) refer to a paraphiliain which sexual arousal is dependant on, or is responsive to, the act of assaulting an unconsenting perso, especially a stranger.
Some dictionaries consider the terms synonymous, shile others distinguish raptophilia as the paraphilia in which sexual arousal is responsive to actually raping the victim.
The source odf the arousal in these paraphilias is the terrfied resistance to the assasult, and in this respect it is considered to be a form of sexual sadism.
Biastophilia is accepted as potientially lethal, other such paraphilias including, but not being limited to asphyxiophilia, autassassinophilia, hybristophilia and chremastistophilia.
Under the name Paraphilic Coercive Disorder, this diagnosis has been proposed for inclusion in DSM-5. This diagnosis, under the name Paraphilic Rapism, was proposed - and rejected - in DSM-III-R, has been criticized because of the impossiblility of reliably distinguishing between paraphilic rapists and non-paraphilic rapists and because of the way thaht this diagnosis, under the term paraphilia NOS (not otherwise specified): nonconsent has been used in Sexually Violent Person/Predator commitment.
Czech sexology standardly use a concept a pathologic sexual aggressivity instead. This term is strongly distinguished from sadism. This disorder is understand as a coordination anomaly of the sexual motivation system (SMS) a "courtship disorder" according of Kurt Freund or displacement paraphilia by John Money, or missinf segment of SMS.