[ Hormones in the milk might be the problem. ]
It is not only Milk but there are many other sources of Phytoestrogens...
I oberved this with my two sister in laws last week. My one SIL lives nearby and is a retired teacher. She had two kids from a previous marriage before she married my husband's brother. One of her children is a 30 year old girly sort of heterosexual man. My other SIL came out to visit with her 4 grandchildren, one of whom is a hyper male 10 year old boy. (I get the biggest kick out of the kid). Any way. It was fun to watch SIL number 1 try not to lose it as SIL number 2's grandson touched everything he came in contact with, used is sleeve as a napkin, chased turkeys etc. Boy stuff.
Good Times!