Homophobia.

Back in the days of the Hollywood film star homosexuals stayed firmly in the closet. Louis B. Mayer, the boss of MGM, had a cunning plan to discover who among his stars was queer. Near to the studio he opened a brothel and made no secret of the fact that if any of the batchelor staff did not make regular visits they would be sacked.
Things have changed in the USA since those days and even the Republicans have back-pedalled on this. Maybe it is because a senior Republican congressman was caught attempting to seduce under-aged young men and vice president Dick Chesney has a lesbian daughter.