Magazines from 1948~1970 had some interesting commercials for male underwear. But some of the commercials were very boring, and here they are below!
Throughout history, there have been statues of naked men. And throughout history, there have been psychopathic meatballs who decided to cover up the statues' sex organs with a fig leaf, starting a long, miserable history of censorship.

Yes, haven't you heard? The male body is inappropriate and evil, so it must be covered up. Behold the fig leaf brief. Big big underpants, for the man who needs to hide what Nature gave him. This handsome daddy has a microscopic wiener anyway, and even looking at naked Eve behind the tree isn't making his loins stir one inch. Could it be that women aren't his cup of tea?
This next one has a nice pose, but once again, the guy's briefs have been padded so much, that no hint of male genitals remains. Pity.
What's the use of wearing Reis Scandals if you can't show them off to another man? This poor guy--he only has his dog, but the dog doesn't care about the man's briefs, unfortunately.
Boys in the locker room like to snap towels at each other. This picture is kind of puzzling, because it's the same man in 2 poses. The garters are sexy but those big, flat shorts are not. 
Sometimes, the artists seem to have run dry of inspiration, so they just drew a picture of a man standing there in his panties. Here are 2 such ads.
This last one is the most interesting. Once again, Mom is out of the house (she's always out!), and that's the cue for Dad and Junior to strip down to their underpants and play in the living room. Mom has just telephoned, and Junior answers, while spreading his legs in an interesting way. Dad looks on, approvingly. There is something so deliciously homo-erotic about all this, but I don't know exactly what it is. All I know, is that this would be a dull world indeed without underwear ads like these!