A man who had sex with a 13-year-old girl was jailed for three and half years at Lincoln Crown Court on Monday.
David Cant, 28, at first denied having intercourse with the teenager and then later claimed he thought she was aged over 16.
But a jury convicted Cant of knowingly having sex with the 13-year-old on three occasions in April last year.
Cant, from Grantham, was also ordered to register as a sex offender and banned from working with children for life.
The court was told Cant made no comment after police found used condoms at locations where he went with the girl, who cannot be named for legal reasons.
The court heard Cant was living with his partner and family at the time of the intercourse but chose to end the relationship himself after a few days.
Chris Geeson, mitigating, said the girl did not initially want to make a complaint against Cant and had made the first contact in the relationship. Mr Geeson told the court Cant received over 200 text messages from the girl during the few days of their encounter.
Cant, of Woodlands Drive, Grantham, denied three charges of sexual activity with a child between April 17 and 20, 2009.
Passing sentence Recorder Andrew Campbell told Cant: “Having listened carefully to the evidence I do not believe you were predatory or grooming this young girl. It was she who contacted you first, and there were a substantial number of text messages, over 200 sent to you.
“It is clear she had a particular fondness for you and made her intentions clear to you, as she told the police she fancied you. But you were twice her age, you were living with your partner and family, and succumbed to temptation.”