You know, in the Baroque era men sung in their falsetto (sounding like women). They lived successful lives and still married women, except they couldn't have children (culturally important, since they thought you lived on in your children, so this was a huge dilemma for them that they had no choice in). Singing has been a male dominated thing historically as well.
At the age of 10 or so, if they were noted by their music teachers to be musically proficient and talented the father would force the child to be castrated. The man never developed a typical male voice, and they all (at least the talented ones) would lead successful lives. They would also sing women's parts. Though women were still banned in singing in other places like the church (Verdi's 'Requiem' was transformed to more of a concert oratorio than a church mass because women were still banned from singing in the church at the time Verdi composed this in the 19th century).
They eventually stopped castrating men (called the castrati), women were able to sing in operas, etc etc. This is just a 'repeat' of history, in a sense it's come back in style so to speak (except they don't actually castrate men anymore).
It's not really effeminate . Infact, the falsetto is exclusively something a man has (different from a female's). There's also contraltos (women who sing lower in male range).