dr wendy walsh is a director of psychiatry and an advisor of a company that deals with this, instant chemistry. let's start with the pheromone parties, can we figure out if we have chemistry with someone by with? >> we can. what it indicates is dispirit immune systems. if two people mate, we take blue eyes were one, long legs, brown hair, but with immune systems they combine. the more different the other personal's immune system, the wide range of disease, the fitter the child will be. if the child is fitter, mother nature made a way to get us that child, hot sexual fashion. >> smelling pheromones is the way, it's documented. >> i can imagine not liking the way someone smells, but if you are not attracted to the person, your personality doesn't match with them, how does the smell make is difference. >> spoken like a perfect man, because your eyes are what you are looking for in a woman to show fertility. women use their nose. women can't stel. here is a problem. we take big showers before a date. we pile on perfumes, plenty of women have the birth control pill. and there's evidence t

dr wendy walsh is a doctor of psychology, and an advisor to a company that deals with d.n.a. swabs, significant chemistry. good to see you. billions to be made in the dating world. let's start with the fera moan parties. can we figure out if we have chemistry with someone by smelling a t-shirt they slept in? believe it or not, we dan. pheromones indicate dispirit immunecm. when two mate, they take blue eyes from one, long legs from one, brown hair from another. with immune systems they combane. the more different, the more wide range of diseases they can fend off, the fitter the child will be. if the child is fitter, mother nature has made a way to get the child, that is hot, sexual fashion. smelling pheromones creates documented. >> i can see rejecting someone because of not liking the way they smell. if you are not attracted to the person physically, how - you know, your personality doesn't match with them, how would the smell make a difference. >> spoken like a perfect man. your eyes are the things you are looking for in a woman to show fertility, fitness, but women use th