Most cross dressing and transgender escorts do it because they like it, and because there's a demand for their services. I'm sure if you look around (specially in California) you'll find Asian escorts who dress like boys and act in a masculine way with their clients.
One more thing I wouldn't call boys or bois folks over the age of 25 even if they're short and smooth. Just my 2 cents like @bigvalboy used to say! I @ him but I'm sure he's watching us with Daddy from heaven!