bloke takes his 10 year old daughter to london, gets a taxi ...............

and as they are going around looking at the sites the the girl spots women hanging around street corners, she asks her dad who are all these ladies?
the taxi driver starts to say what they are, but the dads interupts,
'oh erm , dont worry about them love , they are ladies of the night'

taxi driver pipes up ' daaant be a caaaant guv tell er the truth. they are prostitutes darling they sell their bodies for sex to sleazy men'
the dad is a little put out by this , but the girl continues
'dad do prostitutes have babies?'

of course they do love, where do you think taxi drivers come from'