We all have them: massive gaps in our knowledge that absolutely should not exist. Whether it's from incompetent schools, hesitant parents, or just never having someone correct you on the topic, they need to be answered. I, for example, attended a school district that was comedically conservative with regards to sex ed. Everything we got from the presentation on sexual development at the end of elementary school is covered multiple times over in every science textbook made past grade 7. I'm 19 years old, recently hooked up with a woman for the first time, and now we're seeing each other. As embarrassing as it is, I have no idea how long a period lasts because of my shitty schools and the social anxiety I had in high school, and I'm too afraid to ask her about it and appearing immature/childish. This is my knowledge gap. Anyways, post the gaps in your knowledge that need to be remedied ASAP, and hopefully someone will answer you. Better to have an awkward conversation now than to wind up in an extremely awkward situation later.