I think Ken-san is comparing the numbers of male vs female talent yes? At any given time there are about 10,000 women shooting AV professionally in Japan. For men, the number is marked at about 70. Besides the stigma both groups face, I think pay is fairly low for men same as in the US. There are many amateur performers both male and female and when we are talking fetish (no sex) the numbers balloon even more.
Most pro talent are anchored to agencies who have exclusive deals with certain studios.
I know a few actors who shoot straight, gay and transgender scenes with no problems.
Some talent can play the field. Often it is based on who the shooter is, who he is working for and who he knows. Get one or more wrong and "no talent for you today sir."
Bukkake gangbangs are a whole other thing.
