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Is it dangerous for me to swallow another man’s ejaculate after giving him a blow job?

I’m a 25-year-old man and ⎼ for the last month ⎼ I’ve been sneaking away with a male co-worker so I can perform oral sex on him. He says it gives him relief because he gets turned on by all the provocatively dressed women we work with. Last week, I confided in a female co-worker and she said we should stop. She said that if I give a guy a blow job and swallow, eventually the protein from his sperm will mix with mine and cause an infection in my balls. Is that true?