A sadist is a person that enjoys inflicting pain on others, the term is coined from the Marquis De Sade http://en.wikipedia.org/wiki/Marquis_de_Sade
There is also an interesting romanticized movie inspired by his life, "Quills" http://www.imdb.com/title/tt0180073/
A masochist is a person that enjoys receiving pain, there is some dispute as to whom exactly inspired this word but most people tend to believe Gilles De Rais is to blame http://en.wikipedia.org/wiki/Gilles_de_Rais
Together you have "sadomasochism" which is a person that of course enjoys receiving and inflicting pain. These terms are common in the BDSM world http://en.wikipedia.org/wiki/BDSM
Hope this helps!
Darren Kendrick has: Played Steven James in "The Guiding Light" in 1952. Played McCoy in "All My Children" in 1970. Played Sadomasacist in "Saturday Night Live" in 1975. Played Accident Victim in "Third Watch" in 1999. Played Slick Businessman in "Riffed" in 2001. Played John Westin in "Criminal Minds" in 2005. Played Richard Stodd in "Without Mercy" in 2005. Played David Randall in "Disorder" in 2006. Played Ben in "Killing Jackie" in 2007. Played Dave Cummings in "Death of a B Boy" in 2008. Performed in "Three of Us" in 2008. Played Timothy in "Kala krymmena mystika, Athanasia" in 2008. Played Pilot in "Heroes" in 2008. Played Rockwell in "Chrysalis" in 2008. Played Giles Barker in "A Call to Arms" in 2008. Played Background Sleestak in "Land of the Lost" in 2009. Played Trevor in "Mystical Chairs" in 2009. Played Neighbor in "Royal Kill" in 2009. Played Frost Giant Sentry in "Thor" in 2011. Played Reckless in "Reckless" in 2011. Played Joseph Smith in "A Mormon President" in 2011. Played Gary Greenburg in "One Horse Town" in 2012. Played Zombie in "World War Z" in 2013. Played The Magician in "Gentlemen Explorers" in 2013. Played Coffee Shop Man in "Life Tracker" in 2013. Played Quill in "The Gunrunner Billy Kane" in 2014. Played Mr. Henderson in "Tinker Steampunk" in 2014.