The Federal Communications Commission has warned the nation's two leading cable TV companies that unwanted conditions could be imposed on their proposed acquisition of a rival if they do not agree to curb the proliferation of sexually explicit programming, according to company sources.

Faced with what some are describing as an ultimatum, Time Warner Inc. and Comcast Corp. have sought to satisfy FCC Chairman Kevin J. Martin's demands by pressuring the rest of the industry to come to a consensus on how to respond, said these sources, who requested anonymity because of the sensitivity of the regulatory approval process.

Ugh.