A decision by the Tokyo District Court to reject a compensation case against a night club hostess who had a long-running sexual relationship with one of her clients effectively endorses adultery, experts say.

The ruling said the man's wife was ineligible for compensation from the hostess because of the business motive for the relationship — to retain a good customer.

Similar suits in the past have awarded damages against a third party who had a sexual relationship with a married person, in what is considered a measure to support marriage.