I thought you called it "John Thomas".
We certainly do, but it's so enriching to have a choice of words that suit different occasions and social strata. The old John Thomas, or 'JT', as it sometimes gets shortened to (sounds a painful process I know) tends to be used more in working class circles, while Richard is definitely aristocratic level as in 'Jolly good to see you Giles, old boy, been busy with the Richard of late?'
Then there are other derivatives - 'the old man' (as the description implies, more for the senior citizens), 'the todger' (upper middle class), 'the hampton' (more cockney slang - see a cockney visibly cringe and withdraw at the mention of 'Hampton Court' - you can actually see his eyes start to water), and then there are those with a trans-atlantic influence, such as ' the one-eyed trouser snake' (although, on second thoughts, that may have an Australian background). I am sure I can remember a few more given time, but it's all too easy to turn keen interest into dedicated boredom if you dwell too much on a subject, so I'll leave it there. Sorry about this Itsjulie, but you'll get used to the way written words of individuals seldom stay long with the original subject matter. Deviation is rife in the Cellar!