SINGAPORE - A man who threatened to upload videos of himself having sex with a 14-year-old girl online unless she continued to sleep with him was jailed for a total of four years on Wednesday.

The 27-year-old pleaded guilty to four out of 21 charges.

The man got to know the girl through a traditional dance club in April 2012.

Four months later he moved into her home and slept in the living room with her younger brother, staying for a few months. They then began a sexual relationship.

A district court heard that in April 2013, they had consensual sex on the staircase of a Housing Board block in Jurong West.

On Nov 7 that year the man took the girl to his teenage cousin's flat in Pandan Gardens where he got him to film them having sex.

Deputy Public Prosecutor Rachel Ng said the girl was scared but gave in as he was too strong for her. When the man told her to have sex with his cousin she refused, but he shouted and raised his hand as if he was about to slap her.

The cousin - whose case is pending -got onto the bed and did as he was told.

Later the man sent her messages threatening to upload the video clip if she did not have sex with him whenever he wanted it.

Four days later he took her to his cousin's home and abused her again.

The girl eventually made a police report in February last year.

None of the parties can be named for legal reasons.

A doctor from the Child Guidance Clinic said the victim was left feeling sad, fearful, angry and suffering nightmares.