Sore throat from sex?

My husband has gotten a sore throat the past 3 times we have had oral sex. He will wake up the morning after, having to clear his throat a lot and it feeling a little sore. I mean, it could be allergies, but it’s consistently been the past few times following him giving me oral. It goes away after a day or 2. Anyone else experience this? Thoughts? Obviously I don’t have an STD.