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Evolutionary Psychological Science

, Volume 4, Issue 2, pp 158–165 | Cite as

Arching the Back (Lumbar Curvature) as a Female Sexual Proceptivity Signal: an Eye-Tracking Study

  • Farid Pazhoohi
  • James F. Doyle
  • Antonio F. Macedo
  • Joana Arantes
Research Article

Abstract

It is common in studies of human mate preference to have participants judge the attractiveness of photographs in which models adopt a neutral facial expression or a neutral body posture. However, it is unlikely that humans adopt neutral expressions and postures in normal social circumstances. One way in which posture can vary is in the curvature of the lower spine. In some non-human animals, a “lordotic” posture (in which the lower spine is curved towards the belly) is associated in females with readiness to mate. In humans, this posture may serve a similar function, attracting heterosexual men. In this study, participants were presented with computer-generated images of female bodies in which the back curvature was systematically manipulated. The result showed that small changes in lumbar curvature are associated with changes in the perception of attractiveness. Specifically, the result showed that there is a relationship between the range of the back curvatures used in this study and attractiveness, such that increasing the curvature increased the perception of attractiveness. Additionally, as the curvature increased, participants looked longer and fixated more on the hip region of the female bodies. This paper argues that the attractiveness of women in lordotic posture is due to a conserved mechanism across the taxa which signals proceptivity to men.

Keywords

Lumbar curvature Lordosis Proceptive behavior Receptivity Sexual behavior Eye-tracking 

Notes

Acknowledgements

This study was conducted at the Psychology Research Centre (UID/PSI/01662/2013), University of Minho.

Funding Information

This study was supported by the Portuguese Foundation for Science and Technology and the Portuguese Ministry of Science, Technology and Higher Education through national funds and co-financed by FEDER through COMPETE2020 under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007653). FP receives funding from FCT Portugal through grant SFRH/BD/114366/2016; AM receives funding from FCT Portugal through grants PTDC/DTP-EPI/0412/2012 and PEST-C/FIS/UI607/2011; JA receives funding from FCT Portugal through grant IF/01298/2014.

Compliance with Ethical Standards

Each participant gave written informed consent. The experiment was approved and conducted in accordance with ethical committee guidelines.

Conflict of Interests

The authors declare that they have no conflict of interest.

References

  1. Aou, S., Oomura, Y., & Yoshimatsu, H. (1988). Neuron activity of the ventromedial hypothalamus and the medial preoptic area of the female monkey during sexual behavior. Brain Research, 455(1), 65–71.CrossRefPubMedGoogle Scholar
  2. Beach, F. A. (1976). Sexual attractivity, proceptivity, and receptivity in female mammals. Hormones and Behavior, 7(1), 105–138.CrossRefPubMedGoogle Scholar
  3. Berenbaum, S. A., & Beltz, A. M. (2011). Sexual differentiation of human behavior: effects of prenatal and pubertal organizational hormones. Frontiers in Neuroendocrinology, 32(2), 183–200.CrossRefPubMedGoogle Scholar
  4. Burt, A. (1992). ‘Concealed ovulation’ and sexual signals in primates. Folia Primatologica, 58(1), 1–6.CrossRefGoogle Scholar
  5. Clark, A. S., Pfeifle, J. K., & Edwards, D. A. (1981). Ventromedial hypothalamic damage and sexual proceptivity in female rats. Physiology and Behavior, 27(4), 597–602.CrossRefPubMedGoogle Scholar
  6. Clegg, M. T., Santolucito, J. A., Smith, J. D., & Ganong, W. F. (1958). The effect of hypothalamic lesions on sexual behavior and estrous cycles in the ewe. Endocrinology, 62(6), 790–797.CrossRefPubMedGoogle Scholar
  7. Cobey, K. D., Buunk, A. P., Pollet, T. V., Klipping, C., & Roberts, S. C. (2013). Men perceive their female partners, and themselves, as more attractive around ovulation. Biological Psychology, 94(3), 513–516.CrossRefPubMedGoogle Scholar
  8. Dixson, A. (1998). Primate sexuality: comparative studies of the prosimians, monkeys, apes, and human beings. Oxford: Oxford University Press.Google Scholar
  9. Dixson, A. (2009). Sexual selection and the origins of human mating systems. Oxford: Oxford University Press.Google Scholar
  10. Dixson, A. (2015). Primate sexuality. The International Encyclopedia of Human Sexuality, 1–9.Google Scholar
  11. Dixson, B. J., Grimshaw, G. M., Linklater, W. L., & Dixson, A. F. (2010). Watching the hourglass. Human Nature, 21(4), 355–370.  https://doi.org/10.1007/s12110-010-9100-6.CrossRefGoogle Scholar
  12. Dixson, B. J., Grimshaw, G. M., Linklater, W. L., & Dixson, A. F. (2011). Eye-tracking of men’s preferences for waist-to-hip ratio and breast size of women. Archives of Sexual Behavior, 40(1), 43–50.CrossRefPubMedGoogle Scholar
  13. Doyle, J. F. (2009). A woman's walk: attractiveness in motion. Journal of Social, Evolutionary, and Cultural Psychology, 3(2), 81–92.CrossRefGoogle Scholar
  14. Doyle, J. F., & Pazhoohi, F. (2012). Natural and augmented breasts: Is what is not natural most attractive?. Human Ethology Bulletin, 27(4), 4–14.Google Scholar
  15. Fink, B., Hugill, N., & Lange, B. P. (2012). Women’s body movements are a potential cue to ovulation. Personality and Individual Differences, 53(6), 759–763.Google Scholar
  16. Fink, B., Weege, B., Neave, N., Pham, M. N., & Shackelford, T. K. (2015). Integrating body movement into attractiveness research. Frontiers in Psychology, 6.Google Scholar
  17. Flanagan-Cato, L. M. (2011). Sex differences in the neural circuit that mediates female sexual receptivity. Frontiers in Neuroendocrinology, 32(2), 124–136.CrossRefPubMedPubMedCentralGoogle Scholar
  18. Garza, R., Heredia, R. R., & Cieslicka, A. B. (2016). Male and female perception of physical attractiveness: an eye movement study. Evolutionary Psychology, 14(1), 1474704916631614.CrossRefGoogle Scholar
  19. Goy, R. W., & Phoenix, C. H. (1963). Hypothalamic regulation of female sexual behavior: establishment of behavioral oestrus in spayed guinea-pigs following hypothalamic lesions. Journal of Reproduction and Fertility, 5(1), 23-NP.CrossRefGoogle Scholar
  20. Grammer, K. (1990). Strangers meet: laughter and nonverbal signs of interest in opposite-sex encounters. Journal of Nonverbal Behavior, 14(4), 209–236.CrossRefGoogle Scholar
  21. Guéguen, N. (2012). Gait and menstrual cycle: ovulating women use sexier gaits and walk slowly ahead of men. Gait & Posture, 35(4), 621–624.CrossRefGoogle Scholar
  22. Guéguen, N. (2015). High heels increase women’s attractiveness. Archives of Sexual Behavior, 44(8), 2227–2235.CrossRefPubMedGoogle Scholar
  23. Haselton, M. G., & Gildersleeve, K. (2011). Can men detect ovulation? Current Directions in Psychological Science, 20(2), 87–92.CrossRefGoogle Scholar
  24. Henley, C. L., Nunez, A. A., & Clemens, L. G. (2011). Hormones of choice: the neuroendocrinology of partner preference in animals. Frontiers in Neuroendocrinology, 32(2), 146–154.CrossRefPubMedGoogle Scholar
  25. Kendrick, A. M., Rand, M. S., & Crews, D. (1995). Electrolytic lesions to the ventromedial hypothalamus abolish receptivity in female whiptail lizards, Cnemidophorus uniparens. Brain Research, 680(12), 226–228.CrossRefPubMedGoogle Scholar
  26. Leedy, M. G., & Hart, B. L. (1985). Female and male sexual responses in female cats with ventromedial hypothalamic lesions. Behavioral Neuroscience, 99(5), 936–941.CrossRefPubMedGoogle Scholar
  27. Lewis, D. M., Russell, E. M., Al-Shawaf, L., & Buss, D. M. (2015). Lumbar curvature: a previously undiscovered standard of attractiveness. Evolution and Human Behavior, 36(5), 345–350.CrossRefGoogle Scholar
  28. Malsbury, C. W., Kow, L.-M., & Pfaff, D. W. (1977). Effects of medial hypothalamic lesions on the lordosis response and other behaviors in female golden hamsters. Physiology and Behavior, 19(2), 223–237.CrossRefPubMedGoogle Scholar
  29. Marlowe, F. (1998). The nubility hypothesis. Human Nature, 9(3), 263–271.CrossRefPubMedGoogle Scholar
  30. McCarty, K., Darwin, H., Cornelissen, P. L., Saxton, T. K., Tovée, M. J., Caplan, N., & Neave, N. (2017). Optimal asymmetry and other motion parameters that characterise high-quality female dance. Scientific Reports, 7, 42435.  https://doi.org/10.1038/srep42435.CrossRefPubMedPubMedCentralGoogle Scholar
  31. Miller, G., Tybur, J. M., & Jordan, B. D. (2007). Ovulatory cycle effects on tip earnings by lap dancers: economic evidence for human estrus? Evolution and Human Behavior, 28(6), 375–381.CrossRefGoogle Scholar
  32. Moore, M. (1985). Nonverbal courtship patterns in women: context and consequences. Ethology and Sociobiology, 6, 237–247.CrossRefGoogle Scholar
  33. Moore, M., & Butler, D. (1989). Predictive aspects of nonverbal courtship behavior in women. Semiotica, 3, 205–215.Google Scholar
  34. Pazhoohi, F., Macedo, A. F., Doyle, J. F., Arantes, J. (2017). Waist to hip ratio as supernormal stimuli: effect of contrapposto pose and viewing angle.Google Scholar
  35. Prokop, P., Onyishi, I. E., Okafor, C. O. & Pham, M. N. (2017). Preliminary evidence for existence of oral sex in a rural igbo community in Southeast Nigeria. Human Ethology Bulletin, 32(3), 129–140.Google Scholar
  36. Robarts, D. W., & Baum, M. J. (2007). Ventromedial hypothalamic nucleus lesions disrupt olfactory mate recognition and receptivity in female ferrets. Hormones and Behavior, 51(1), 104–113.CrossRefPubMedGoogle Scholar
  37. Röder, S., Carbon, C. C., Shackelford, T. K., Pisanski, K., Weege, B., & Fink, B. (2016). Men’s visual attention to and perceptions of women’s dance movements. Personality and Individual Differences, 101, 1–3.CrossRefGoogle Scholar
  38. Silva, J., Macedo, A. F., Albuquerque, P. B., & Arantes, J. (2016). Always on my mind? Recognition of attractive faces may not depend on attention. Frontiers in Psychology, 7, 53.PubMedPubMedCentralGoogle Scholar
  39. Smeets, J. B., & Hooge, I. T. (2003). Nature of variability in saccades. Journal of Neurophysiology, 90(1), 12–20Google Scholar
  40. Wenzlaff, F., Briken, P., & Dekker, A. (2016). Video-based eye tracking in sex research: a systematic literature review. The Journal of Sex Research, 53(8), 1008–1019.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Farid Pazhoohi
    • 1
  • James F. Doyle
    • 2
  • Antonio F. Macedo
    • 3
    • 4
  • Joana Arantes
    • 1
  1. 1.Department of Basic Psychology, School of PsychologyUniversity of MinhoBragaPortugal
  2. 2.StillwaterUSA
  3. 3.Vision Rehabilitation Laboratory, Department and Centre of PhysicsUniversity of MinhoBragaPortugal
  4. 4.Department of Medicine and OptometryLinnaeus UniversityKalmarSweden

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