Yup. Horny teens can figure out their genitalia combo much easier than many infants figure out latching

I once read an account of an octogenarian woman in a nursing home. A new doctor was assigned to her. Looking over the medical records, she'd had chronic urinary infections her entire adult life, until her husband passed away. She had urinary incontinence her entire adult life. They never had any children, though not for lack of trying.

Turns out that her husband had been penetrating her urethra throughout their marriage. When the old woman was questioned about these medical issues by the doctors, she told him that though it had hurt the first time, she expected it to and never thought much of it. Nor had she connected the onset of incontinence and infections with the act.

So no, I don't think that this is necessarily true, either.

Story of my life.