'My dong' is a 'body part,' yes, but it is also more than just 'that.'
'My dong' is a 'surface.' It is a 'medium.' It has a 'feel.' It has 'responsiveness.' Like 'oil painting' or 'watercolor,' 'jacking it' is its own 'thing.' It has its own 'pen/brush dynamics,' its own 'interactivity.'