wear leathers...

One of my favorite rides out here is a twisty turny road up through a canyon 5 miles from my work. In Colorado they don't use salt on the roads they mostly use sand and gravel.
It's almost worse than riding on a completely gravel road cuz it acts like ball bearings on pavement. Come spring you have to be ready in turns for all the gravel and sand to knock you down...so I ride really careful until the stuff is gone...

Not sure if you mean gravel on a paved road, or gravel roads.  As others have pointed out, big difference.  Gravel on a paved road is more dangerous than a gravel road.

I'm trying to cure myself of the habit of going down every "un paved" road I might see.  To me, it's fun!! but the bike hates it after a while.  I have busted a muffler mount, loosened many a bolt and nut, lost my gremlin bell, chipped a fork, grooved a tire (rock up in the fender.. grind!!), etc, etc.
With that said.. darn if I still don't just go out there and do it.

As you surmised, corners are the most interesting.  What I try to look for is a groove made by truck tires that I can plant the front wheel in to act as a mini-bank for the corner.  Sometimes, the edge of the road (or the middle) has a nice ridge that I can use.  No, it won't save your bacon (sorry) if the ridge/groove gives way and the tire slides off, but it can be a help.
Try to stay in the tire tracks or where there is the minimum of loose stuff.  If you need to cross from one tire track to the other to setup for the next turn, do it easy and don't try to turn as you go across, lots of loose stuff in the middle.
You need to plan further ahead than normal.
Keep it SLOW!  or put knobby tires on..

Keep your arms loose and relaxed,... allow the handlebars to self correct.
The centrifugal force of the turning wheels wants to keep the bike upright and forward moving,... relaxing your arms lets that happen...
Also,... if you start to wash out in a deep pocket, don't slow down,... gas it a little,... this too, will increase the centrifuge action of the wheels and lift the bike to vertical...

EDIT... I meant gyroscopic force not centrifugal...  That's the force that lets you ride with your feet up...
Ever try to keep your feet up at a traffic light?... very tricky!...
'Cause your gyroscopes aren't turning ...

May the force be with you... ...

I bit it once on just a slight bit of loose gravel going up a driveway--I made the mistake of gripping the front brake. Down I went. (Only time ever, so far.....) And I almost bit it going slow around a corner--it had rained earlier, road was still damp. I hit one of those painted turn arrows--front tire went out like I was on ice. Somehow I managed to stay upright.
Stay alert, slow down on turns, plan ahead.  Be safe.

A few thoughts jump to mind:
Smoooooth
Relax
Don't
ATGATT

And if that doesn't work:
Speed Dial
I want a new MC
médico

Piglet, I don't like gravel either.  I would rather ride across any other surface than gravel with the exception of snow or ice..
Now if your talking of packed gravel or loose gravel their again are 2 different riding surfaces.

I find a slow steady pace as well as not using the front break helps one to avoid being toppled.

Maybe you can go back to that section of road and practice your technique as sounds like you handled it well with the hubby's instructions.