Dear readers: My husband sometimes picks his calls when we're having sex

From a female reader

My husband is in the habit of picking his calls when we are having sex. He would pick his phone and actually talk into it while he's pumping away. I find it so annoying. I've told him severally to stop but he says it's not a big deal. His voice is usually coordinated when he's talking on the phone during sex, I don't know how he does it but how can I get him to stop? Are there other women experiencing this?