That depends on your reasons for doing so. If you did so in order to have more play time and more toys, I think it would apply.
Well, let's see: I'm single (and likely to remain so). Given that, it would be rather irresponsible of me to have children, yes? What's more, I'm not fond of children; I find them annoying nuisances. As for play time and toys (interesting that you'd couch it in those terms instead of saying free time and spending resources on one's self), it's certainly a factor. I have no desire to invest tens of thousands of dollars and years of my time on a child...so why should I? It's my life to live, not that of an as-yet hypothetical offspring.
Does that make me selfish? Not as I use the word. Selfishness in this context would be forcing taxpayers to support other people's children. I won't say one word against the Duggars, but Octomom having 8 kids on public assistance? That's selfish.
Suppose a couple makes the perfectly rational choice to have children because they'd rather spend their resources and time on each other. How could that possibly be characterized as "irresponsible"? Who are they being irresponsible towards?