No-one Ever Has Sex at a Wedding by Tracy Bloom

In Katy’s opinion, weddings should follow some basic rules:
1) No-one should ever have sex. Of course. The married couple has the rest of their lives for that, and the guests should be too busy partying.
2) If you are heavily pregnant (as Katy is) you should obviously not be invited to three weddings in the space of one summer. Your husband’s accident-prone best friend, your attention-seeking colleague, your 73-year-old mother’s marriage to her Spanish toy boy – all without even an alcoholic drink to make them bearable.
3) During the speeches, it should not be revealed that you had a secret one-night-stand with one of the other guests.
4) Instead of laying bets on the length of the best man’s speech, guests should not be laying bets on whether a marriage will be in ruins before the end of the meal…
But this summer, Katy is lucky enough to be the special guest at the weddings that break ALL of the rules. What could possibly go wrong?