Archives of Gynecology and Obstetrics

, Volume 290, Issue 6, pp 1121–1125 | Cite as

Effect of vaginal intercourse on spontaneous labor at term: a randomized controlled trial

  • Catarina CastroEmail author
  • Maria Afonso
  • Rui Carvalho
  • Nuno Clode
  • Luís Mendes Graça
Maternal-Fetal Medicine



This study aimed at evaluating the effect of vaginal intercourse on spontaneous labor onset at term.


In a randomized controlled trial, patients with singleton, cephalic, term, and low-risk pregnancy were assigned to either vaginal intercourse at least twice a week or abstinence. The following data were assessed: demographics, parity, vaginal coitus frequency before and during pregnancy, Bishop score at 38th weeks, gestational age at delivery, mode of delivery, and days between recruitment and delivery. The primary outcome was spontaneous labor onset.


Of the 123 patient analyzed, 63 were assigned to study group and 60 to control group. Mean interval between study recruitment and delivery was higher in sexually active women (15.05 days ± 0.8 compared with 14.17 days ± 0.8, p = 0.45) as well as the rate of cesarean delivery (14.3 % compared with 10 %, p = 0.58), but the differences were not statistically significant. The rate of spontaneous labor was similar in both groups (84.1 % in vaginal coitus group; 75 % in control group, p = 0.26).


Our results showed that vaginal intercourse does not hasten spontaneous labor onset at term.


Spontaneous labour Vaginal intercourse Delivery Randomized 


Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Catarina Castro
    • 1
    Email author
  • Maria Afonso
    • 1
  • Rui Carvalho
    • 1
  • Nuno Clode
    • 1
  • Luís Mendes Graça
    • 1
  1. 1.Obstetrics, Gynecology and Reproductive Medicine DepartmentCentro Hospitalar de Lisboa Norte – Hospital de Santa MariaLisbonPortugal

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