article_snippet: Adam Johnsonpictured left and right with girlfriend Stacey Flounders) was arrested on suspicion of having underage sex with a girl, 15, after she reportedly boasted about the alleged encounter on social media .
article_snippet: In a statement, a Durham Police spokesman said: 'A 27-year-old man was arrested earlier today on suspicion of sexual activity with a girl under 16.
highlights_snippet: Adam Johnson arrested on suspicion of having sex with a 15-year-old girl .
  
highlights_snippet: Adam Johnson was arrested for underage sex after 'teenager boasted about relationship and teenager father found out'
  Adam Johnson timeline: Sportsmail takes a look at Adam Johnson career .