Context is useful here: "Drive-In Saturday" is about lads who get their social education from movies ("It's a crash course for the ravers")...in the unconnected times of yore, before porn was pushed at you through every orifice in your computer and you can see on cable the kind of action once reserved for 'medical' films. Mr. Bowie seems also to be referring to the Twenties, when serials were popular and a certain kind of romantic set-up was played out over and over again. See it enough times, and you might remember how to do it yourself. It's sort of innocent now, innit?
Oh, listen to you - you'll turn my head!
Actually, like so many know-it-alls, my ignorance can be appalling...like the identity of Silvian. There's a Wikipedia article on Dr. Silvian Schweber, a noted quantum physicist. I'd not be surprised if the husband knew of him...and it wouldn't astound me if Mr. Bowie did, but that's the best I can come up with on short notice.
I always thought it was supposed to be a joke. People always call one another "buddy" so I thought a English teen trying to learn about sex from American movies just thought that a bunch of americans were named buddy due to the people saying it all the time.
Well yeah, I think that's right. "His name was always Buddy", implying that his real name was something else, but people always called him by that nickname. The narrator may not even know his real name.
I always thought the line alluded to the naming conventions of Twenties comedies; 'Buddy' would be the name of a stereotypical innocent guy. Actually, I had an Uncle Buddy myself. It was a fairly common name once.
Just a shot in the dark, but 'Sam Therapy and King Dice' sound like obscure musicians that Mr. Bowie may have admired, or plays on their real names. One should never take anything straight in any of his lyrics.
I've always thought of Sam Therapy and King Dice as references to Syd Barrett and King Crimson. Robert Fripp, guitarist on 'Heroes' was a member of King Crimson and since at the time, Bowie tended to write his lyrics at the mic, I just put two and two together and made the assumption.
I read somewhere that Drive In Saturday was about a near future where people forgot how to express themselves physically with their love partners so they watched prono films to re-learn the boudoir arts. If that is indeed what The Gentleman is singing of in this song, then, I guess, the guy in the porno films was always named/nicknamed "Buddy."