In my experience, females way outnumber males in almost all forms of dance, at all levels. Since I consider dance to be a lifetime skill (you can still dance socially at retirement age, but can you still do gymnastics, cheerleading, or soccer? Generally, NO), I think it's sad that the boys are missing out.
I've heard male ballet dancers called danseurs (French?). However, at the studio I used to work for, we jokingly referred to them as ballerinos (like in Spanish, when you indicate the gender by an A or an O at the end of a word). It may be a lame joke, but there are a lot of Spanish speaking people around here, and it just makes logical sense. Granted, this was not a ballet company - it was a dance studio with a children's dance company (mostly tap and jazz performances, some ballet).
Girls in studios in this area just have to get used to occasionally playing boys in performances. Not lead parts - those match the gender they are supposed to be. But the "boys" in the first part of the Nutcracker (the party)? Those are often girls with their hair hidden.
While I was pregnant, I told my DH quite firmly that no matter the sex of the baby, s/he would be encouraged to take dance. I really do believe it is a lifetime skill.
Sorry if this wondered a bit OT.