Try paying to have a snake sexed, being told it was a female. Brumating her and putting her to a known male and have nothing happen for a while. Then, bringing her back and paying again to have her sexed, another $10 and being told that she is still a female. Then trying to breed her again, with NO SUCCESS!! Then, for S/G's I bought a probing kit, had a friend come over to show me how to do it, then only to discover that the female I have spent $20 sexing, is in fact a male.
Wayne