Hi Denis,
I have answered in the other thread where you ask the same question....
they are very hard to sex. the body and head shape is very slightly different when viewed from above, but quite hard to see. when they are sexually mature the male will have more hair on his body than the female. you can see how hairy his lower body is in the pic in the breeding article , but he only gets all this hair when he is ready to breed. The female has less hair.