Their might some males in JW, but they are probably either born sterile or are genetically engineered to successfully impregnate females for a number of times/for a certain period of time before they are made sterile. I'd say the second choice is most likely, simply as a precaution.
_______________
The undisputed dominant predator of Jurassic Mainframe.
If you don't know history, then you don't know anything. You are a leaf that doesn't know it is part of a tree. Michael Crichton
If you're concerned about where this franchise is headed, then please join us.