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Furthermore, previous research has investigated the idea that female sexual preference for male face shapes varies with the probability of conception across the menstrual cycle. Findings showed that during a ‘high conception’ stage of the menstrual cycle, women were more attracted to men with less feminine faces for short term relationships (Penton-Voak et al, 1999). As well as mate preferences, research has also found that menstrual cycles affect sexual behaviour frequency in premenopausal women. For example, women who had weekly sexual intercourse with men had menstrual cycles with the average duration of 29 days, while women with less frequent sexual interactions tended to have more extreme cycle lengths (Cutler, Garcia & Kreiger 1978).