Ds seeing on loo seat and floor - how to stop this?

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Unless I'm there supervising, ds wees in the look but around the seat (which he refuses to lift up unless supervised), and on the floor.
It seems to be deliberate, as he can aim fine when someone is with him.

Any ideas how to stop this?

Title should say weeing.

sitting down?

putting cheerios in the toilet bowl to aim for?

What about sitting down? DS(7) sits down for most of the wees, his aim is not very good. My DN (17) still does.

He refuses to sit down.
Will put Cheerios in, good idea, thanks :)

it's all good until some helpful guest decides to fish them out of the toilet.

ds1 is dreadful for doing this. We see transient improvement if we get him to wipe up the mess so that is worth a try.

I'll tell him that too One, thanks.

Thank you, more things to try :)

He's bloody wee'd behind the settee in the lounge
He hasn't admitted it, but keeps bringing the subject up with a sort of smirky "I can't tell you because you'll be cross" look on his face.
My house is like a stinky urinal.
Why? Why is he doing this?