Government brokers responsible for collecting billions of dollars in federal oil royalties operated in a "culture of substance abuse and promiscuity" that included having sex with energy company employees, accepting lavish gifts and rigging contracts to favored firms, investigators said Wednesday. The alleged transgressions involve 13 former and current Interior Department employees in Denver and Washington. Their alleged improprieties include influencing contracts, working part-time as private oil consultants and having sexual relationships with — and accepting golf and ski trips, snowboarding lessons and concert tickets from — oil company employees, according to three reports released Wednesday by the Interior Department's...