There are plenty of boys enslaved in the sex trade for homosexual sex tourists.
And it's doubtful that you'll be able to get every adult woman out of prostitution (whether it is voluntary or forced servitude).
There is also slavery in Africa in the agriculture industry (parents even sell their children into slavery).
It is happening in pretty much every city in America, right under our noses. We probably won't be able to rescue all of them, but even if one is rescued...I keep thinking, what if it was MY daughter who was kidnapped and forced into this. It makes me sick to my stomach.