Rayburn W F, Wilson E A
Am J Obstet Gynecol. 1980 Aug 15;137(8):972-4. doi: 10.1016/s0002-9378(16)32841-1.
The coital activities of 111 patients who delivered after spontaneous premature labor were compared to a matched group of patients who subsequently delivered at term. The percentage of patients who were sexually active, the mean coital frequency, and the incidence of orgasm with coital activity were not significantly different between the two groups. Coital activity in the group delivering prematurely was significantly greater (p less than 0.05) than that in the group delivering at term only when no apparent reason for premature labor (18 or 111 cases) was evident. This relationship was especially true after the thirty-second week of gestation. Normal coital activity does not result in premature delivery and should not be discouraged during pregnancy in the absence of complications.
将111例自然早产分娩后的患者的性交活动与随后足月分娩的匹配患者组进行比较。两组之间有性活动的患者百分比、平均性交频率以及性交活动时的性高潮发生率没有显著差异。仅在没有明显早产原因的情况下（18例或111例），早产组的性交活动明显多于足月分娩组（p小于0.05）。这种关系在妊娠32周后尤其明显。正常的性交活动不会导致早产，在没有并发症的情况下，怀孕期间不应加以劝阻。
