...but it's fun to speculate.
My
father sent me this graph the other day (probably from some project he's working on):

The blue line represents the percent of all births to unmarried women, tallied by the vertical axis on the left. It's interesting, but disregard it for the moment and look at the pink line and the vertical axis on the right. The pink line represents the birth rate among 15 to 17 year olds - that is, the percent of all 15- to 17-year old girls who gave birth in a given year. From 1960 to the early 80s, the line is a bit jerky (much like some of the lads these ladies might have been canoodling with, I'm sure), but has a downward-sloping trend overall. Starting in the mid-1980s, though, there is a very clear spike in the teen pregnancy rate, followed by an equally clear and steady decline starting after 1992.
Why did the teen pregnancy rate go up under Reagan and Bush Sr. and decline under Clinton? Well, it's tempting to say it's because federally-administered abstinence-only sex education
made its debut under Reagan, and because Reagan and his
disciples worked tirelessly to restrict access to abortion. And the nonstop downturn during the Clinton years could be a coincidence. But I've yet to come up with a better explanation, especially since the rate's steady decline starts slowing down the year that our current president was elected and looks ready to flatline.
Scratch that - there is one (relatively) nonpartisan explanation: heterosexual teenagers finally got wise to the AIDS crisis and started using condoms more regularly. Condoms: a two-for-one deal! Still, there does seem to be at least a
correlational relationship between teen pregnancy and partisanship, according to this table I found via Daily Kos (in this case measuring births per 1000 girls ages 15-19):

Striking. But again, it's just a correlation.
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