Hard to see in the pic but does look female, as doesn't appear to have large hemi-penal bulges at the base of its tail. I also think the smooth knobbies, in males,have a larger spur or projection in the at the base of their tails (white lumps/protrusions) that is obvious when looked from dorsal (above) aspect.
Thanks all and thanks DrNick for that great sight of Dr Danny Browns.After looking at that and your replies I am sure I have 2 females.Once again Thanks.
These are rough knob tails, not smooth so the tails are different, however the anatomy in the vent region is similar. Note the very obvious bulges (he is a well endowed little boy):