Laddie is 3yrs and regularly uses the pottie; for a while the difficulty was getting him to get off again. He’d happily settle down for a 20-30 minute session, usually as you were about to go out somewhere! I’d second the leaving the door open when you’re using the bathroom; there is also very little cuter than having him sit down next to you with his own copy of Singletrack; he likes to play ‘spot the bike on every page’.
We’ve introduced stickers and sticker books as an inducement/reward, 1 sticker for using the potty but 2 if he tells us he wants to use the potty ahead of time (still v. much the weakness).
As far as gross/embarrassing goes, that would be laddie recently prancing round the bedroom with a fully loaded nappy of pebbles which progressively ‘dribbled’ out of the leg cuff and rolled across the floor. We found/cleaned up all but one, which the dog cleaned up for us…
Dogs are disgusting 🙂