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This study is an interesting addition to the growing body of literature on biological and cyclic influences contributing to copulation. In general, coitus has been found more likely to occur at or around the time of ovulation. Previous research has found that women's sensitivity to olfactory stimuli is related to the menstrual cycle and estrogen production, with the greatest sensitivity occurring during the ovulatory phase. Similarly, sensitivity to pain appears related to the cycle and is most decreased at the time of ovulation. The present study indicates that the greatest sensivity to visual stimuli also occurs around the time of ovulation. All these findings are seen in line with the theory that sensory thresholds for those modalities mediating sexual receptivity would vary at the time of ovulation in order to increase the probability of copulation and hence conception. Additional data from other authors studying subjective sensations imply that emotional tendencies generally vary in the direction of greater stability, self-satisfaction, and feelings of pleasure during ovulation. From the point of view of evolution these emotional and sensory variations are seen as adaptive for the perpetuation of the species.