Just today a research article was released on the study of chemical cues humans use to identify the opposite gender. It seems that as humans we have similar chemical cues as pheromones. Apparently just using our nose we can smell androstadienone (in males) and estratetraenol (in females) on an unconscious level. After smelling these hormones a person can identify of judge if the walk of a certain person is more feminine or masculine. However, this doesn’t mean that a woman can smell another woman’s estratetraenol and think her walk is more feminine. The study shows that only males smell the estratetraenol and judge the walk to be feminine. Similarly, the women can smell the androstadienone in men and judge the walk as being masculine, whereas men cannot do it. The article is linked below.