Funny film with an implausible plot

Rating: 7/10 (4 May 2017)

This is a romantic sex comedy film about a television presenter, Alison, who becomes pregnant after a drunken one-night stand with a man whom she meets in a nightclub.
There are a lot of laughs in this film, but they're diminished somewhat by the implausibility of an attractive, intelligent career girl not being on contraception and choosing to jump into bed with an irresponsible, overweight, uneducated, poor, unattractive, unemployed layabout.
Leslie Mann is very good as Alison's sister, Debbie.
This was followed by a spin-off, This Is 40 - in which Debbie and her husband are the main characters.