I've actually been hit by this recently looking at a study of hormonal response to nuero stimulation where the study was ONLY done on men. I thought...what kind

I've actually been hit by this recently looking at a study of hormonal response to nuero stimulation where the study was ONLY done on men. I thought...what kind of study is only done on men? Particularly when the response was found to be an increase in prolactin levels? Now we have to try and do the study on women.