Can Sharon, ‘an extraordinarily good-smelling woman’, and Rob, ‘a sturdy love-maker’, navigate the thorny situations they find themselves in and still find time for an emergency shag in a stairwell?
Sharon faces the reality of having a new room-mate in the form of Rob, the man whose child she happens to be carrying. She introduces him to her brother Fergal who gives them both a royal hard time.
Sharon keeps waking in the night worrying about her pregnancy whilst Rob is having problems generating business for the advertising agency and is relieved to run into Chris, who, on a night out, suggests a career change. Sharon is not encouraging. Sharon herself meets up with old flame Owen, who is now married to a best selling authoress, which makes Sharon feel a failure. Fortunately for her Rob is sympathetic.
Rob meets Sharon's parents, who are delighted about the engagement but less so about the pregnancy. Worse is to come when Sharon is told that, as an older mother, she runs the risk of giving birth to a Downs Syndrome baby. Rob also has to explain to Fran that Chris is out drinking with him and not having an affair but this too ends in disaster.
Rob is fired by Skype for failing to bring in enough custom but loose cannon friend Dave gets him an interview - and a job offer- with a chemical firm of dubious reputation. Sharon rings Rob's mother with a wedding invite and is shocked to hear something Rob never told her - that his former girlfriend Betsy had a miscarriage. However after the pair have celebrated Sharon's birthday with friends and relatives they have a heart to heart which clears the air - almost.
Fergal is delighted to act as Rob's best man but he is also permanently drunk, his wife having left him, whilst Sharon's maid of honour Kate is annoyingly excitable and gets lost on the hen night, having met an eligible man. Rob's stag party, organized by Dave at a pole dancing club, fares no better as Fergal punches Dave and Chris cops off with an old flame who is one of the dancers. At least the wedding goes smoothly but catastrophe strikes on the honeymoon.