Biastophilia (from Greek biastes, "rapist" + -philia) and its Latin-derived synonym raptophilia (from Latin rapere, "to seize"), also paraphilic rape, is a paraphilia in which sexual arousal is dependent on, or is responsive to, the act of assaulting an unconsenting person, especially a stranger. Some dictionaries consider the terms synonymous, while others distinguish raptophilia as the paraphilia in which sexual arousal is responsive to actually raping the victim.

The source of the arousal in these paraphilias is the victim's terrified resistance to the assault, and in this respect it is considered to be a form of sexual sadism.

Under the name paraphilic coercive disorder, this diagnosis was proposed for inclusion in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition. This diagnosis, under the name paraphilic rapism, was proposed and rejected in the DSM-III-R. The diagnosis has been included, however, in the International Classification of Diseases as "other paraphilic disorder involving non-consenting individuals."

It has been criticized because of the impossibility of reliably distinguishing between paraphilic rapists and non-paraphilic rapists, and because of this diagnosis, under the term Paraphilia NOS (not otherwise specified), non-consent had been used in Sexually Violent Person/Predator commitment.

A standard concept in Czechoslovak sexology is pathologic sexual aggressivity instead. This term is strongly distinguished from sadism. This disorder is understood as a coordination anomaly of the sexual motivation system (SMS), a "courtship disorder" according to Kurt Freund or displacement paraphilia by John Money, or a missing segment of SMS.