I'm pretty sure this was unintentional.

No, Unintentional. Remember, if 1960, the Flintstones were having a 'gay old time.' Word meanings change. Boner really used to mean mistake, not ... you know.

Here's the "Wookieepedia" entry discussing it:
http://starwars.wikia.com/wiki/Soon_Bayts

according to the sainted OED, the earliest cited usage of the word 'boner' to refer to an erect penis in print is really late, in clancy sigal's 1968 novel, 'going away', as in, 'the little dog used to raise a boner every time it walked into a room...'. not too much of a stretch to think that denizens of gotham's criminal underworld were familiar with rude terms for stiffies a few years ahead of the general public, so i'd lean towards justified smirking on this one.

at the risk of seeming unduly concerned, if anyone turns up an earlier example explicitly attached to a tumid member, please do flag it up on here, so i can let my mate over at OED know; it doesn't mention 'bone-on' at all, which is an obvious shortcoming. it's important to keep up on these things.

If that doesn't scream "boner," I don't know what does.

And to tie this all together, the actor who played Boner Andrew Koenig (son of Walter “Chekov” Koenig) played the Joker in the fan film “Batman: Dead End”

I think you win this one.

An analogous situation was in the 1960s Frankie & Annette "Beach Party" movies. In the first one, Bob Cummings played a scientist who could "freeze" people by touching a particular spot on their foreheads with the tip of his finger. Boneheaded biker Eric Von Zipper (whom Bob taught to do it, but he couldn't make it work on anybody but himself) & his gang called this "giving [the victim] the finger." They meant the joke, but it got past the censors.

You were so busy forcing me into a boner, you forgot you were committing one yourself!

If we accept that the word was known as slang for a stiffy at the time, even if only by a few, then the above quote means that the writer was one of those few.

I read a Wizard interview with Garth Ennis years ago, and he was saying that when he wrote the comic 'The Demon' he called a demon in it Baytor.
And in one issue he had Baytor become king of hell, and had a scene where all the demons were yelling/singing 'All Hail the Master Baytor' and characters said 'Master Baytor' throughout.
Apparently it got right through and was about to be printed, and someone said the name outloud and realised what he'd done.
Ennis had thought it'd get picked up straight away, he'd put it in as a joke for the team/editors, and was quite enjoying seeing how close to print it would actually get.

This should be an Urban Legend!

If I had a source, you know it would be!

I’d vote for intentional as the writer clearly knew what he was up to and like Brian said above, it could easily slip past the editors.

That's what I heard. I cite a source that seemed pretty authoritative at the time, but I forget what that source is.

This should be an Urban Legend!

Pops music does this a lot, or rather did, as now you can say these things outright.
Which is a shame.

I'd vote for intentional as the writer clearly knew what he was up to and like Brian said above, it could easily slip past the editors.

Does anyone know who the creative team on the issue were by the way?

Incidentally, the Penguin Dictionary of Historical Slang (edited down from Eric partridge's classic original) records yet another meaning: "sharp blow", used at a couple of English Public Schools in the 19th century.

I think they were getting away with something- the dirtier meaning was sort of known but obscure enough that it would fly over the heads of most readers.

Yeah, that would be how it could be considered intentional - if you think that boner was considered (at the time) such an obscure slang word for penis that the writer knew he could get it past editorial without anyone noticing.