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However, it seems that mate-preference shifts driven by luteal phases of the cycle may not be as robust as shifts seen during late follicular phases. When responses to this question were analyzed using PCA, the three factors that were extracted coincided with several previously proposed theories on possible functions of romantic kissing. To determine if key hormones associated with the menstrual cycle might be acting as underlying drivers of participant responses, linear regression analyses were carried out, regressing estimated levels of estradiol and progesterone onto answers to the same questions. It has been proposed that because mating in the luteal phase of the menstrual cycle involves little risk of conception, women at this time pursue decision strategies geared towards affiliating with individuals likely to provide a supportive social environment, such as kin DeBruine et al. Since it has been previously suggested that semiochemicals found in skin oils and pheromonal secretions might convey information about underlying health and genetic quality Durham et al. Oestradiol level and opportunistic mating in women.

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Participants For analyses involving the binary variable of women in their late follicular and luteal cycle phases only, participants consisted of 50 women in the luteal phase and 34 women in the late follicular phase of their menstrual cycle at the time of completing the survey.

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Nathalie. Age: 31.
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It is interesting to note than women in the late follicular phases of their cycle also show increased sensitivity to odors and display faster odor processing times Doty et al. Based on previous findings that romantic kissing can serve a mate assessment function, the present study was designed to explore whether menstrual cycle shifts can be seen in female attitudes towards romantic kissing at different stages of a relationship. Major histocompatibility complex alleles, sexual responsivity, and unfaithfulness in romantic couples.

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