As an ISTP male, (95% I), I have no desire to have children. Most of the ISTP's I know share my view point as well. Even if we like other peoples kids, we notice how much work it is from observation. Fact is we know that already. When new parents yack about all the work, were like "you didnt see that coming?" We would have no alone time to chill. Raising kids looks stressful.
And what about worldwide over POPULATION? As 'realist' ISTP's see this loud and clear. Hello breeders...there are too many people on the planet.
Although most ISTP's would do everything possible to be good parent, given a choice most would pass. I am very in touch with people close to me, and very personable with these people, so I would make a good dad, but have no desire for fatherhood. This makes relationships almost impossible - I can date younger women that actually don't know if they want children or go for ones my age that have kids already. When ever I meet someone childless my age, seems her first question is do I want kids - instant deal breaker for both.
No it's not lazy to not want kids. Lets face it most of us are created accidentally. I don't know of a single kid who was planned.
Raising kids is tedious and stressful. I love my kid to death but having my freedom taken away has actually caused me to become depressed. My own stupid fault of course so....