存在，叫做sadism也就是施虐，我确信sm中s就是这个词的缩写。
那么sadism和sadist施虐和施虐者是怎么定义的呢？照抄一段大英百科全书中的定义，我想应该足够权威了：
sadism:psychosexualdisorderinwhichsexualurgesaregratifiedbytheinfliofpainonanotherpersonthetermwasedbythete19th-turygermanpsychologistrichardvonkrafft-ebinginrefereothemarquisdesade,an18th-turyfrenanwhoicledhisownsuchpracticessadismisoftenmasochism(qv),inwhichsexualarousalresultsfromreceivingpain,andmanyindividualsrespondiherrolethesadist,however,oftenseeksavictimwhoisnotamasochist,assomeofthesexualexcitementderivesfromthevictimsunwillingnessthelevelaentofsadisticlencemayvarysiderably,frominfliofmildpaininotherwiseharmlesslovepytoextremebrutality,somimesleadingtoseusinjuryordeaththesatisfaofthesadistmayresultnotfrominfligactualphysicalpainbutratherfromthementalsufferingofthevictimsexualurgesmaylimittheleveloflence,butinsomecasestheaggressiveimpulsebeespredominantandthesadistprogressestomoreextremeexpresnsofhislenttendenciessadismmaybeafactorinsomelentcrimes,particurlyrapeandmurder
简单的翻译一下，没有字字对译：
施（本章未完，请翻页）