Talking to friends or sex?

Let’s say your laying in bed at 11 pm and your SO is beside you. It has been made clear that sex is going to happen and they are patiently waiting for you, but just as slide into bed your cell rings. Do you pick up the phone? Which is more important? And would you be angry if they picked up the phone knowing that it wasn’t an emergency call (caller ID). What if the call was a friend of theirs of the opposite sex? How would you feel?

I hope I’m being clear. I’m gathering this information second hand.