Then why do they keep teaching people that interrupted intercourse is not a valid form of contraception? Is it because they don't trust the average citizen to know that this is only true for a washed penis that has pissed after its last ejaculation?

med school student here, recently spent a few months in a pregnancy and child care part of the university hospital, and let me tell you: it is impossible to impregnate someone in case you don't come inside her. The prostatic liquid, the one that comes out of your dick, contains NO SPERM if you pissed after your last ejaculation. PLUS, the chances of impregnating someone even with a dick covered in last sex's cum is low as fuck, hell, even if you blast 5ml of sperm inside the girl you have about 30% chance of impregnation, supposing you're both fertile

so why do we keep lying to people? I legit want to ask people here if I'm wrong here, but I talked to a few professors and they agreed with me that if you:
fuck without protection with a washed dick that has pissed after its last ejaculation and do not come inside the girl, there is no chance of having a sperm cell at all inside the vagina

so why do we keep lying to the average joe? is it to shill for pills and condoms? Yes I agree most people would only pull out near the point of orgasm, and not a few seconds prior to it, but I feel like lying about it, even with good intentions, is just wrong