Kecurangan (kata dasar: curang) atau keselingkuhan/perselingkuhan (kata dasar: selingkuh [sĕ-ling-kuh]^[1]) difahamkan sebagai tindakan melanggar persetiaan hubungan emosi atau seks yang terjalin bersama pasangan secara khusus atau eksklusif sesama mereka^[2] tanpa rasa jujur si pelaku kepada pasangan tersebut^{[3]:maksud I} sehingga mengakibatkan perasaan marah, cemburu, dan persaingan.^[4]

Keterlibatan seseorang dalam mengkhianati hubungan intim dengan pasangan boleh mendatangkan seberapa kesan mendalam apabila kegiatan tersebut diketahui:^[5]

• Rasa malu muncul sebagai akibat perasaan terhina dan direndahkan, malah menyangka diri sebagai penyebab pencurangan lalu meningkatnya kemungkinan mencari-cari kesalahan dalam diri sendiri tanpa disedari.
• Kebuntuan fikiran kerana menghadapi situasi yang menjejaskan keutuhan hubungan yang terjalin sesama diri
• Kekesalan yang muncul berikutan rasa kecewa diri terhadap ketidaksetiaan pasangan sampai melakukan tindakan curang sedemikian

Tindakan pencurangan yang disaksikan pasangan atau orang kenalan mampu memberi kesan utama kepada penelitian dan pemberian keputusan dalam mengurus kes-kes cerai termasuk pampasan harta warisan, penjagaan anak-anak hasil hubungan bersama, kelayakan mendapat alimoni dan sebagainya.

Mazhab Katolik

Mazhab Protestan

• Dayus
• Perempuan simpanan
• Penggodaan
• Kegasangan
• Seks luar nikah
• Zina

• Moultrup, David J. (1990). Husbands, Wives & Lovers. New York: Guilford Press.
• Pittman, F. (1989). Private Lies . New York: W. W. Norton Co.
• Rubin, A. M.; Adams, J. R. (1986). "Outcomes of sexually open marriages". Journal of Sex Research. 22 (3): 311–319. doi:10.1080/00224498609551311.
• Vaughan, P. (1989). The Monogamy Myth. New York: New Market Press.
• Adult attachment and patterns of extradyadic involvement Family Process, Dec 2004 by Elizabeth S. Allen, Donald H. Baucom
• AN INTEGRATIVE INTERVENTION FOR PROMOTING RECOVERY FROM EXTRAMARITAL AFFAIRS Journal of Marital & Family Therapy, April 2004 by Gordon, Kristina Coop, Baucom, Donald H, Snyder, Douglas K
• Managing Infidelity: A Cross-Cultural Perspective by Anne Buckmaster, William Jankowiak, M. Diane Nell; Ethnology, Vol. 41, PART 1, pages 85–100 2002
• Infidelity: The Lessons Children Learn by Jennifer Harley Chalmers, PhD
• Professor Kristina Gordon's research into infidelity and betrayal
• Cybersex and Infidelity Online: Implications for Evaluation and Treatment by Kimberly S. Young, Alvin Cooper, Eric Griffiths-Shelley, James O'Mara, and Jennifer Buchanan Paper Published in Sexual Addiction and Compulsivity, 7 (10, 59–74, 200
• DeSteno, D. A.; Salovey, P. (1996). "Evolutionary origins of sex differences in jealousy? Questioning the fitness of the model". Psychological Science. 7 (6): 367–372. doi:10.1111/j.1467-9280.1996.tb00391.x.
• Harris, C. R. (2000). "Psychophysiological responses to imagined infidelity: The specific innate modular view of jealousy reconsidered". Journal of Personality and Social Psychology. 78 (6): 1082–1091. doi:10.1037/0022-3514.78.6.1082.
• Roughgarden, J.; Akcay, E. (2010). "Do We Need a Sexual Selection 2.0?". Animal Behaviour. 79 (3): E1–E4. doi:10.1016/j.anbehav.2009.06.006.
• Hirsch, Jennifer S.; Meneses, Sergio; Thompson, Brenda; Negroni, Mirka; Pelcastre, Blanca; Del Rio, Carlos (2007). "The Inevitability of Infidelity: Sexual Reputation, Social Geographies, and Marital HIV Risk in Rural Mexico". American Journal of Public Health. 97 (6): 986–96. doi:10.2105/ajph.2006.088492. PMC 1874214. PMID 17463368.
• Hupka, Ralph B.; Buunk, Bram; Falus, Gábor; Fulgosi, Ante; Ortega, Elsa; Swain, Ronny; Tarabrina, Nadia (1985). "Romantic Jealousy and Romantic Envy: A Seven-Nation Study". Journal of Cross-Cultural Psychology. 16 (4): 423–46. doi:10.1177/0022002185016004002.
• Vandello, Joseph A.; Cohen, Dov (2003). "Male Honor and Female Fidelity: Implicit Cultural Scripts That Perpetuate Domestic Violence". Journal of Personality and Social Psychology. 84 (5): 997–1010. doi:10.1037/0022-3514.84.5.997. PMID 12757144.
• Barta, W. D.; Kiene, S. M. (2005). "Motivations for infidelity in heterosexual dating couples: The roles of gender, personality differences, and sociosexual orientation". Journal of Social and Personal Relationships. 22 (3): 339–360. doi:10.1177/0265407505052440.
• Donovan, S.; Emmers-Sommer, T. M. (2012). "Attachment style and gender as predictors of communicative responses to infidelity". Marriage & Family Review. 48 (2): 125–149. doi:10.1080/01494929.2011.626670.
• Lalasz, C. B.; Weigel, D. J. (2011). "Understanding the relationship between gender and extradyadic relations: The mediating role of sensation seeking on intentions to engage in sexual infidelity". Personality and Individual Differences. 50 (7): 1079–1083. doi:10.1016/j.paid.2011.01.029.
• Lammers, J.; Stoker, J. I.; Jordan, J.; Pollmann, M.; Stapel, D. A. (2011). "Power increases infidelity among men and women". Psychological Science. 22 (9): 1191–1197. doi:10.1177/0956797611416252. PMID 21771963.
• Leeker, O.; Carlozzi, A. (2012). "Effects of sex, sexual orientation, infidelity expectations, and love on distress related to emotional and sexual infidelity" (PDF). Journal of Marital and Family Therapy. 40 (1): 68–91. doi:10.1111/j.1752-0606.2012.00331.x. PMID 25059413.
• Shackelford, T. K.; LeBlanc, G. J.; Drass, E. (2000). "Emotional reactions to infidelity". Cognition & Emotion. 14 (5): 643–659. CiteSeerX 10.1.1.564.1918. doi:10.1080/02699930050117657.