A 17 year old , still living with his parents, returns home one evening and his father says
'son you look very pleased with yourself'
well dad, today i had sex for the first time replies the boy.
Congratulations son says the father i'm really pleased for you, in fact you deserve a present, i'll buy you a new pushbike, but you will have to wait till next pay day.
Thats allright dad i don't mind waiting, my arse is to still to sore to ride a bike.