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: psychosexual disorder in which sexual urges are gratified by the infliction of pain on another person. The term was coined by the te 19th-century German psychologist Richard von Krafft-Ebing in reference to the Marquis de Sade, an 18th-century French nobleman who chronicled his own such practices. Sadism is often linked to masochism (q.v.), in which sexual arousal results from receiving pain, and many individuals respond in either role. The sadist, however, often seeks a victim who is not a masochist, as some of the sexual excitement derives from the victim's unwillingness. The level and extent of sadistic violence may vary considerably, from infliction of mild pain in otherwise harmless love py to extreme brutality, sometimes leading to serious injury or death. The satisfaction of the sadist may result not from inflicting actual physical pain but rather from the mental suffering of the victim. Sexual urges may limit the level of violence, but in some cases the aggressive impulse becomes predominant and the sadist progresses to more extreme expressions of his violent tendencies. Sadism may be a factor in some violent crimes, particurly rape and murder.
简单的翻译一下，没有字字对译：
施虐是指通过给他人施加痛苦而达到性满足，这个词因萨德侯爵而来，与因接受痛苦而唤起性兴奋的受虐相对应。然而，施虐狂经常会寻找一些并非受虐狂的人来做施虐的对象，因为他们的某些性兴奋正是来自于对方的不情愿。施虐造成的伤害差别很大，从性爱游戏中轻微无害的疼痛到极端暴力，有时导致严重伤害或死亡。施虐狂得到满足也许不是rou体上施加痛楚而是受害者Jing神上遭受折磨。性表达也许局限于某种程度的暴力，但有时攻击性占有欲太强，而导致极端的暴力倾向。施虐可能是某些暴力罪案发生的因素，特别是强jian和谋杀。
以xanthe而言，她在里面就塑造了一对和skinner/mulder完全对应的主奴，以强制调教的方式让他的奴隶变得柔软而顺从。而在里面更是身体力行了一回，里面的劳lun斯就是个典型的施虐狂，mulder的不合作显然让他得到了更大的乐趣，征服的乐趣。而一旦被打破，驯服的奴隶反而会让他失去胃口。他最后放mulder走，也是出于不愿mulder被彻底打破而变得柔顺的心态。所以，真正的施虐狂，也许并不见得很享受完全服从的奴隶，但他们确实是S，也确实能从征服中获得乐趣。但是，他们并不是大众所能接受的那种主奴关系中的主人，那种视照料M的需求为己任的主人。
当然，这毕竟是，那么现实生活中又是怎么样的呢?我们知道确实有人在玩这种危险的D/S主奴游戏和强制调教，比如近期的那个奥地利把女儿囚禁地牢充当性奴的禽兽父亲，还有我以前提到的卡罗事件，等等，心理学家也对此做出了分析，还是直接引用他们的话吧：
这是一个连接：
卡罗事件就是这个