They did. In regular health education/sex education. Thats why cycle tracking methods are difficult to rely on and they encourage ocp and other contraceptive methods to prevent pregnancy (stds aside). Because it is difficult to pinpoint the exact window of ovulation.
I just cant help myself. Feel free to block me. My pitbull saved my family's life from a home invader. She's never left alone with the children. I can put my face next to her bowl while she eats without issue. She has never growled or bit (and would be put down if she did).