Triplet Honeymoons Joke

A mother had triplet daughters and, sure enough, they all got married the same day. On their wedding night, mom tells each one to write back about their married life. To avoid possible embarrassment to their new husbands by openly discussing their love lives, the mother and daughters agree to use newspaper advertisements as a "code" to let the mother know how their love lives are going.

Two days later the letters start to arrive from the various honeymoon destination spots.

The first one has the simple message: "Maxwell House Coffee". The mother gets the newspaper and checked the Maxwell House advertisement, and it says, "Satisfaction to the last drop." Mother is very happy.
The next day she gets the second letter. It reads: "Rothman's Mattresses". So the mother looks at the Rothman's Mattresses ad and it's headlined, "Full Size, King Size". And the mother is happy.
But she waits and waits for the third letter. It finally arrives after three weeks and has the message: "British Airways". Mother is at first perplexed, and when she finally finds the British Airways ad she fainted. The ad read:
"Three times a day, seven days a week, both ways."