Yeah it's even weirder when you realize that a teenage boy really just wants a baby. Deep down his sex drive is leading him to having a baby and reproducing.
Yeah, I guess the bigger point being missed (by the article and most of the comments) is that there is a whole generation of people having sex but not having kids due to concerns for the future. (Myself included)
The future is still looking pretty bright relative to the rest of human history, unless the subset of people who are very concerned about the future choose not to have kids, in which case not so much.