SEX makes babies - that was all the girl said she knew about sex when she was 11 years old, the age at which she lost her virginity.

Now 13, she recounted matter-of-factly how she met her first boyfriend on the social networking site Friendster last year.

They started exchanging messages before taking their online relationship offline, going out in groups with other people they knew from the Internet.

Then one day, weeks after their first online encounter, she found herself alone at home. Her mother and siblings were not home.

She was online, chatting with the boy, then 16, whom she laughingly described as an 'Ah Beng'. He asked her out, but she invited him to her home instead.

'He said he wanted to meet me but I didn't want to go out, so I wanted him to come to my house. My mother didn't allow me to go out,' she said.

She was worried that her mother would call home to check on her whereabouts, something her mother always did when she was out.

The girl doesn't remember the date, but thinks it was during a weekend. Court details put it at between April 10 and June 30 last year, when she was in Primary 6.

Asked if she thought they would end up having sex, she said it never crossed her mind. But as things turned out, they did. He had a condom with him, she said.

After that day, the pair drifted apart. He was busy with a part-time job as a waiter. And he was, as she put it, 'MIA' or missing in action, for a few weeks.

Then she came across him online; he had logged on to an instant chat service.

'I was shocked yet happy...I just talked to him like normal. Then he just replied (with) a long message...and it ended. It was very disappointing.'

The girl spoke to The Straits Times accompanied by her mother and a social worker on Monday. She cannot be identified because she is a minor.

The teen is believed to be one of the youngest people involved in what is known in legal parlance as 'underage carnal intercourse or sex with a child'.

Read the full story in Thursday's edition of The Straits Times.