They ran on all the top-40 stations. I remember that KKDJ (now KIIS-FM) had them about as often as KHJ.
In fact, you can hear it. Someone clipped it from a 1974 aircheck of Charlie Van Dyke on KHJ, and you get to hear CVD do the live tag:
This is MORNING DRIVE.
It was a very specific thing to that film, though. I don't remember X-rated theater ads on L.A. radio before or after "Deep Throat."
But---San Diego was a completely different thing. This is back when what is now the Gaslamp Quarter was sailor bars, massage parlors, pool halls, X-rated movie theaters and porn shops. KFMB, at the time a few blocks up Fifth Street, when instructing listeners how to drop by to pick up prizes, would occasionally say "we're the first legitimate business on Fifth Street."
Anyway, there were several X-rated theaters and they advertised on several stations, including KCBQ, KGB and KFMB-AM.
I once recorded an aircheck of Perry Allen on KFMB---an adult contemporary station---in 1975.
He had a recorded spot for one of the theaters. It was generic, only mildly suggestive ("the finest in adult entertainment", "ladies welcome"), and then the jock had to deliver a live tag with the name of the movie showing that week and the phrase "shows continuously from noon daily."
All good.
Except that week's film was "Lickity Split."
Perry opens the mic and gets as far as the title, and then falls completely apart. He tries, God bless him, he tries to straighten up, but he just can't.
Trouble was, he tried for close to a minute.
I listened to KFMB daily in those days---that was the last of those commercials I ever heard on that station.
A voracious cassette deck ate that tape in the 80s.
