Just wanted to show a picture of two of my juvenile B.orientalis amplexing. I've caught them amplexing a few times now. I'm actually very surprised...i expected this kind of behaviour would appear with sexual maturity, but my juveniles are less than 3 months from metamorphosis, and about and inch long (head to cloaca).
By the way, i think i have two young males and a possible female (judging purely by amplexus and hind legs size), but time will tell.
Anyway, here they are trying to be grown ups.