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This is a myth within most of us, having it confused with the steroids. Protein Milk (Whey or Casein) is nothing but the pure extracts from the cow milk. To be specific, whey protein, which is taken by many athletes is a byproduct of cheese manufacturing.

Have a look at this article on: Effect of protein source and resistance training on body composition and sex hormones http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1997115/
Source: US National Library of Medicine, National Institutes of Health

Yes there are side effects from the excessive whey but, nothing is related to the sexual hormones
http://www.pharmaceutical-drug-manufacturers.com/articles/whey-protein.html

Steroids

Lean muscle building requires male hormones. So there is no specific reason for the protein milk manufactures to include female hormones to this milk, which may negatively effect their product outcomes. But in dairy milk products contains a certain amount of female hormones which could be included in the whey or casein products, as these two were extracted from milk.

But as per the article published in the Abu Dhabi Food Control Authority (Meat Inspection Unit, ADFCA) by Dr.Hamid Ragab Hamid (http://www.adfca.ae/english/topics/pages/hormonesinmilk.aspx) he mentions that,

“The fore review clearly guides us to the conclusion that dairy products resemble no risk to the humans with respect to bST concentrations. It demands no legal certification that all dairy products from the U.S.A. are rbST-free.”