Ball Bashing?

Dejouvon
So my boyfriend told me to be more rough with his balls. Then asked me if I have ever watch ball bashing porn. I have not and didn't really know this was an actual thing people did. Now I didn't get crazy rough with him like bashing his balls. But I smacked them a little bit and squeezed them pretty hard. He seem to enjoy it so I want to learn more. Anyone have any tips or advice?