Former U.S. Rep. Donald Lukens began serving a 30-day jail term Wednesday for having sex with a teenage girl while he was a congressman in 1988, a judge said.

Judge Ronald Solove of Franklin County Domestic Relations Court said Lukens' attorney, Thomas Tyack, told him that the former congressman decided to go directly to the County Jail Wednesday rather than appear before the judge, who was to impose sentencing Wednesday morning.No further details were immediately available.

The 59-year-old Republican from Middletown was sentenced in June 1989 to the jail term and fined $500 after a jury convicted him of a misdemeanor charge of contributing to the unruliness of a minor. He had sex with 16-year-old Rosie Coffman in his Columbus apartment.

He had been free on bond pending appeal. A state appeals court upheld his conviction in June. The Ohio Supreme Court, the state's highest court, rejected his appeal in November.

Lukens lost his bid for a third consecutive term in the 8th Congressional District GOP primary in May. He finished a distant third in a field of four candidates.

He resigned from Congress on Oct. 24, two days after the House Ethics Committee voted to investigate new charges of sexual misconduct against him. He was accused of making improper advances toward a congressional employee.

He will be succeeded by state Rep. John Boehner, a Republican who won the Nov. 6 general election.

Lukens served two terms in Congress, from 1967 to 1970, and then made an unsuccessful attempt to gain the GOP gubernatorial nomination in Ohio. After 15 years in the Ohio Senate, voters sent him to Congress again in 1986. He was re-elected in 1988.