Just because you “know” something to be so doesn’t make it so.
People in fact do adjust their behaviors based on their understanding of expected consequences.
PP knows this, contraceptives are the seeds they sown in the community to generate business.
No, they really do not. Hormones win out over common sense quite often.
Perhaps, if men who create unwanted pregnancies had to lose a testicle instead of a woman undergoing an abortion, we could do away with the whole notion of birth control altogether.