I well recall HS, when you'd be lucky to get condoms and/or the pill IF you could convince your pediatrician that you got really, really bad menstrual cramps. It was snickered about, and the hurdles were high.
And at least one girl in my HS graduated with a baby (there may have been two), out of a class of 400. This was class of 1979, so it was before HIV concerns but who wanted to see a teen with a kid and no diploma?
Good thing that things have changed.
As for who is responsible - both, ideally - but women should recognize that, dollars to donuts, they are hit harder if there is a failure in that department.