By Anonymous - 16/04/2016 08:32 - United States - San Diego
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Bahaha, that's not how it works out all! He's supposed to pour it down his urethra an hour before sex. I've created a great kit for doing such a thing, and I'd be happy to sell one to him if he /really/ wants to avoid the whole condom/scam thing.
I don't know if any burning would occur, actually. According to CulturesForHealth.com and DoctorOz.com, apple cider vinegar has a pH of 4.25 whereas healthy vaginal pH tends to be between 3.5 to 4.5. While I don't know what negative effects would manifest, it really goes to show how throughly stupid the boyfriend is. If he's hoping the acidity would destroy sperm, all healthy vaginas would, and the human race would, you know, die. The more you know!
Actually the acidic environment of the vagina is there to protect the womb, and -does- kill sperm. Seminal fluid is designed to protect the sperm long enough for them to make it past the vagina and into the uterus. Lemon juice / vinegar / other similarly acidic fluids, as previously stated, have long been used as a contraceptive douche. Heck at one point that's what Listerine was marketed as - a douche/vaginal wash for contraception and "womanly freshness"
But sperm survive in a mostly alkaline environment. So something needs to raise the pH of the vagina slightly so the sperm can survive into the uterus. As someone else pointed out, lemon juice was used as a contraceptive, and I've read that Casanova had his lovers use half of a lemon as a contraceptive (sort of a primitive diaphragm/spermicide type thing, I guess).
Id be very concerned. You can try to teach him sexed since obviously he didn't get correct information, if any. If you choose to have sex, make SURE he wears a condom. Don't just take his word. If he refuses..guess he will have to find something that doesn't take condoms. Like his hand.