You didn't need me, or my pics to see that Poecilotheria is a wonderful genus of tarantulas. I'm glad you're hooked. You should try Poecilotheria ornata. You'll be amazed to see just how pretty they get with age. Lot's of purples. It's something that's hard to photograph. To see them first hand, you'd be hooked.
Most species of Poecilotheria can be visually sexed when they get some size. The species which are darker ventrally (P. formosa, P. ornata, etc.) are even easier to sex visually. It's simple, females will have a noticeable whiteish "split" at the epigastric furrow. Usually around the 4"+ mark is when you really start to notice it. You will notice it in earlier instars of P. formosa. P. regalis is a bit trickier as the belly band kinda blends and the border is inline with the epigastric furrow. Nonetheless, you can still see it. Just hafta look harder.
This "split" is noticeable in other genera also. I see it in some Avicularia species, though the split is not really white, but more maroonish.
Pic is Poecilotheria formosa. Obvious female.