Tbh I think he ignored sex Ed rather than sex Ed failing him. He hated omegas and hated the idea of sex with them so he never needed to learn. I don’t remember if he was a whore with betas but I don’t think he was so he just didn’t have any reason to know any of that stuff. It’s like how a normal person wouldn’t know all the ins and outs of tax law unless they are an accountant or tax lawyer even if everyone knows what taxes are and that we need to pay them. Also, not all scars in that area are c section. My dad had his appendix out and its a lower abdominal scar. I had a laparoscopy and that’s a lower abdominal scar. My mum had a c section and her scar is practically invisible with how well she healed. It could be a tummy tuck or a number of other things too. Unless you are really good at telling apart lower abdominal organs and scar placements, you wouldn’t know what’s what.

"What if you only slept with me because you got swept away by my pheromones?"
(╯°Д °)╯╧╧
My dear wake up, a marked person can't be swayed by 'anyone's' pheromones, except the one who marked them ╥﹏╥