"My buddy's girlfriend says she's allergic to cum. Is that a thing? He says she always want him to get her off but she won't return the favor. She won't jack him or suck him off, and absolutely no fucking. Is this some bogus way to put him off rather than getting him off?"
Oh, it's a thing, all right. It's a form of contact dermatitis - a rash develops that can burn, itch, and be downright painful.
Sperm allergy, sometimes called semen allergy or seminal plasma hypersensitivity, is a rare allergic reaction to proteins found in a man's semen. It mostly affects women. Some common symptoms of sperm allergy are redness, swelling, pain, itching, and a burning sensation in the vaginal area. - ISSM
Remember, medicine has long thought that unejaculated semen is actually toxic to men and is at least partly responsible for prostate cancer. So, it shouldn't surprise anyone that it could cause adverse reactions in some women.
Suggest to your friend that he use a condom - even if he's just looking for a hand job.
If she still refuses to get him off after he's taken care of her needs.... Well, it may not seem fair, but men have been doing this to women for centuries. That doesn't make it right, I know. But, if sex is important to him, he's tired of going home and jacking off...
he needs to find a partner who isn't allergic to cum.
