Women are only fertile for a limited amount of time during each cycle. Sympto-thermal fertility tracking methods, as described in the book "Taking Charge of Your Fertility" by Toni Weschler, empower women to understand exactly when in their cycles they are fertile.
Understanding your personal cycle of fertility means you can accurately predict your period, understand precisely when you have ovulated, know when you are fertile and infertile in your cycle, and avoid the side effects of hormonal birth control.
I have personally used sympto-thermal fertility tracking as my exclusive method of birth control within a relationship for 2 years.
Pregnancy is just one consequence, obviously.
Culturally, a lot of people still would rather use tactics intended (with whatever level of efficacy) to prevent teenagers from being sexually active altogether.
Like our gov and the WHO telling us not to wear masks recently.
Most women in my experience are pretty regular and you can trivially avoid having sex for an exta few days out of the month. Coupled with "external finishes" i have a feeling this is actually a valid method of birth control for responsible couples.
Are you sure neither of you is sterile?
https://www.sexualwellbeing.ie/for-professionals/research/re...
Secondly, if parents were truly concerned about this they would provide condoms, support, and healthcare rather than stern (and ultimately useless) admonitions and, even worse, sexist jokes. It's not a coincidence that states with a reactionary attitude to sex and sexism see the highest rate of teen pregnancies.
I've seen, a number of times, friends & family & random Internet advice-givers of teenage fathers say "Get a paternity test!" or "Don't sign anything". Particularly if they're close with the father but don't like the mother. Sometimes even if the dad-to-be is excited about having a kid. It's a very marked contrast to how we treat adult males (and what we claim to value as a society), where the advice is usually "Time to man up, get a job, and be a dad."
No such thing as a maternity test, and we tend to excoriate young mothers who might want to shirk their maternal responsibilities.
There's probably something revealing there about self-interest and who we identify with in a situation.
Linked case wasn’t even the one I was looking for, but the cause was the same. Still the mother, but surprisingly non-obvious.
And it's because being a young single mom sucks.
Anecdotally, about half the women I know have shared with me stories of men being various levels of inappropriate.