At out local adult novelty store, I bought a little tube of stuff that’s supposed to keep your dick hard for an extended period of time.
Mrs. HeyHomie got some on her mouth.
About a minute or so later she said her lips and tongue were numb.
So, did I basically just rub Ambesol™ (generically known as Novacaine™) on my dong? If not, then what is the magic ingredient in keep-you-dick-hard lube?
One would probably have to know the brand oil you purchased. There are thousands of different remedies out there, most of them don’t work. Some do contain the same ingredients you would find in treatment for canker sores. This is what it sounds like you have. I purchased something called Deep Throat Gel from a certain adult catalog once, for my lady friend to be able to take ‘all of my loving’ once. It was kind of menthol-ly, but would do the same thing and numb her throat, but it also numbed my penis a little bit, I guess which would also pro-long me if necessary. If it is premature ejaculation you are worried about, there was a delightful thread on cock rings earlier!
Anbesol has benzocaine in it, not novocaine.
And yeah, actually it probably was benzocaine, which is a pretty standard ingredient in this sort of thing.
So, yeah, you rubbed baby teething stuff on your dong. Was it good for you? 
Yes, most of this stuff is basically a topical anesthetic. If you don’t have any problem with premature ejaculation, I doubt it would help at all. But if you are a little too quick on the trigger, then blocking some of the stimulus might help. OTOH, my hubby sometimes has the opposite problem, and as a woman I can unequivocally state that sometimes goin’ at it for hours can get tiresome!
It was definitely one of the caines: lido, benzo, nova, michael…
Wouldn’t this effect the woman’s sensation level as well?