Often the pupils will become diluted. Men will also often stand with their hands on their hips to dispay their masculine side. When seated he tends to spread his legs part if interested in the female. Women also tend to have pupil dilation when they are interested in a male. But they also have a flushed appearance in the cheeks.
Women also tend to shake their head in an effort to toss their hair.
A female who is strongly interested will expose the inner sides of her wrists to the male. The palms will also be made visible to the male. When walking towards or past a male of interest the hips will have an accentuated roll. The woman will hold a mans gaze just long enough for him to notice then quickly look away. The mouth remains patially open and the lips appear to be wet.