A sample of 46 females and their partners were used to investigate if males were aware of their partner's premenstrual experiences. Hotelling's T2 revealed that males' perceptions of their partner's premenstrual experiences did not differ from their partner's reports for the number and the extent of affective and behavioural premenstrual changes. However, their perceptions of their partner's somatic premenstrual experiences differed significantly from the female's experience for the number and the extent of changes labelled Water Retention.