Whatever a job advert requests, people will naturally be deterred if they don't meet the requirement. For example, if the job requires a college education, the person without a college education will be deterred. Why waste your time applying for a job that you have a low chance of getting because you fail to meet a requirement? It's very natural to simply not apply.
I would like to know also if the normal behaviour according to psychology of this man will be to contact the employer to query why this employer wants only a female ?