But, in terms of acting, we're really talking about a set of behavioral traits, interests, or "mannerisms" -- the stuff that's meant to set off a well-tuned gaydar.
This suggests that, for straight women, gaydar is more finely tuned close to ovulation when it's relevant -- i.e. when a potential mate is on the scene.
For the gaydar study, scientists tracked the fertility cycles of 40 heterosexual female undergraduate students and asked them to judge photos of 80 men's faces.