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

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 annoy
ing. 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?