(Strip Number 741, Original Publication Date, 7 October 1984)
Panel 1: As you could probably guess, John isn't taking news that something has come along to inconvenience him to a very small degree with anything like grace. His idiotic tantrum begins with his whining idiotically about how Jean can't be pregnant because she's been working with him for years.
Panel 2: After that stupid non-sequitur, he goes on to say that she's never discussed having a family before (because a family can't exist without at least one kid to yell about freeloading off of his poooor father) and how sudden all of this is.
Panel 3: When he bellows "What on Earth were you doing?", Jean is taken aback. She's also wondering if he's stupid enough to not know what sex is or arrogant enough to assume that his needs come before her and her husband's private lives.
Summary: While John does seem dumb enough to not know what sex is, it's more likely that he assumes that the 'forsaking all others' bit is overridden by his need to be an infant taken care of by a mother figure. Also, what the Hell did Rod do to piss Lynn off this time?!?! John spends the week with his innate dipshittiness dialed up to a hundred and eleven.