Modern interpretation of the significance of "wrong his brother" in 1 Thessalonians 4:6, includes sleeping with the brother's future wife. However, 1 Thessalonians 4:3 only specifically prohibits fornication.
Bryan Strong; Christine DeVault; Theodore F. Cohen (2010). The Marriage and Family Experience: Intimate Relationship in a Changing Society. Cengage Learning. p. 186. ISBN978-0-534-62425-5. https://books.google.com/?id=qjvoSOMB5JMC&pg=PA186October 8, 2011閲覧. "Most people agree that we maintain virginity as long as we refrain from sexual (vaginal) intercourse. But occasionally we hear people speak of 'technical virginity' [...] Data indicate that 'a very significant proportion of teens ha[ve] had experience with oral sex, even if they haven't had sexual intercourse, and may think of themselves as virgins' [...] Other research, especially research looking into virginity loss, reports that 35% of virgins, defined as people who have never engaged in vaginal intercourse, have nonetheless engaged in one or more other forms of heterosexual sexual activity (e.g., oral sex, anal sex, or mutual masturbation)."
Carpenter, Laura M. (2001). “The ambiguity of "having sex": The subjective experience of virginity loss in the united states”. Journal of Sex Research38 (2): 127-139. doi:10.1080/00224490109552080.
Bearman, Peter; Brueckner, Hannah (April 2005). “After the promise: The STD consequences of adolescent virginity pledges”. Journal of Adolescent Health36 (4): 271-278. doi:10.1016/j.jadohealth.2005.01.005. PMID15780782.
Lammers, Cristina; Ireland, Marjorie; Resnick, Michael; Blum, Robert (2000-01-01). “Influences on adolescents' decision to postpone onset of sexual intercourse: a survival analysis of virginity among youths aged 13 to 18 years”. Journal of Adolescent Health26 (1): 42-48. doi:10.1016/S1054-139X(99)00041-5. PMID10638717.
Carpenter, Laura M. (May 2001). “The Ambiguity of "Having Sex": The Subjective Experience of Virginity Loss in the United States”. The Journal of Sex Research38 (2): 127-139. doi:10.1080/00224490109552080.
Schlegel, Alice (November 1991). “Status, Property, and the Value on Virginity”. American Ethnologist18 (4): 719-734. doi:10.1525/ae.1991.18.4.02a00050.
Berger, D.; Wenger, M. (1973). “The Ideology of Virginity”. Journal of Marriage and Family35 (4): 666-676. doi:10.2307/350880. JSTOR350880.
Smith, C. Veronica; Shaffer, Matthew J. (2013-03-01). “Gone But Not Forgotten: Virginity Loss and Current Sexual Satisfaction”. Journal of Sex & Marital Therapy39 (2): 96-111. doi:10.1080/0092623X.2012.675023. ISSN0092-623X. PMID23252636.
Jessor, Shirley; Jessor, Richard (1975). “Transition from virginity to nonvirginity among youth: A social-psychological study over time.”. Developmental Psychology11 (4): 473-484. doi:10.1037/h0076664.
“Contraceptive use by 15-year-old students at their last sexual intercourse: results from 24 countries”. Arch Pediatr Adolesc Med162 (1): 66-73. (January 2008). doi:10.1001/archpediatrics.2007.8. PMID18180415.
Bearman, Peter; Brueckner, Hannah (April 2005). “After the promise: The STD consequences of adolescent virginity pledges”. Journal of Adolescent Health36 (4): 271-278. doi:10.1016/j.jadohealth.2005.01.005. PMID15780782.
Lammers, Cristina; Ireland, Marjorie; Resnick, Michael; Blum, Robert (2000-01-01). “Influences on adolescents' decision to postpone onset of sexual intercourse: a survival analysis of virginity among youths aged 13 to 18 years”. Journal of Adolescent Health26 (1): 42-48. doi:10.1016/S1054-139X(99)00041-5. PMID10638717.
Smith, C. Veronica; Shaffer, Matthew J. (2013-03-01). “Gone But Not Forgotten: Virginity Loss and Current Sexual Satisfaction”. Journal of Sex & Marital Therapy39 (2): 96-111. doi:10.1080/0092623X.2012.675023. ISSN0092-623X. PMID23252636.
“Contraceptive use by 15-year-old students at their last sexual intercourse: results from 24 countries”. Arch Pediatr Adolesc Med162 (1): 66-73. (January 2008). doi:10.1001/archpediatrics.2007.8. PMID18180415.
Smith, C. Veronica; Shaffer, Matthew J. (2013-03-01). “Gone But Not Forgotten: Virginity Loss and Current Sexual Satisfaction”. Journal of Sex & Marital Therapy39 (2): 96-111. doi:10.1080/0092623X.2012.675023. ISSN0092-623X. PMID23252636.