90 percent female. There has been instances on here where males had that spot as well. I even had a female who had every indication of a male with a large kok and she bred with a male.
Most likely female only way to know 100 percent is seeing if she lays eggs
The first one is a definite female like what everyone says and also last picture which is a kamfa you posted is a female as well. I can see a tube starting to drop.