A security officer who had sex five times with a 15-year-old student was sentenced to 10 months' jail on Thursday.

Desmond Tan Jun Wei, 24, admitted to two charges of having sex with the girl at his home in Jurong West Street 64 in February last year. Three other charges were considered during his sentencing.

A district court heard that Tan and the girl came to know each other through some mutual friends in November 2012. They then entered into a relationship.

Sometime in February last year, the girl went to his home. He asked if he could have sex with her and she consented.

On a fifth occasion, the victim went to his flat and again had unprotected sex.

They broke up after that. She informed her school counsellor about what had happened between her and Tan.

She made a police report on March 1 at Jurong West Neighbourhood Police Centre, stating that she was raped.

Tan's lawyer, Mr Patrick Fernandez, said his client had not planned to seduce the victim for sexual exploitation.

The age disparity between them was not particularly wide, he added.

Tan is out on $15,000 bail. He was allowed to defer his sentence until April 24.

He could have been jailed for up to 10 years and/or fined on each charge.