A study of recidivism to sexual offences was conducted among Norwegian males who had received their first conviction for a sexual crime during the years 1970-1974. Five hundred and forty-one out of a total of 1,071 offenders were randomly selected and followed by means of official and public register systems until the end of August 1983. No one was contacted personally by the investigators. The recidivism rate was 12.8%, with the rapists having the highest tendency to commit new sexual crimes. Acts like incest, exploitation of someone in the custody of the perpetrator or similar felonies against so-called public morals were least likely to be repeated. Most of the repeat offenders only had one single subsequent offence, either of the same type of crime as at the first or to a less severe crime. Only a handful committed more than one repeat offence. A large number of the sexual offenders had committed others types of crimes, some prior to their first conviction for the sexual crime and some subsequent. Most of our criminally convicted males had a record of mixed criminality, in which crimes of profit and violence dominated.