This is a phrase that I heard quite a bit growing up in Australia. It seems it was used to make us feel better about not having all of our genitals. There are a few things that disturb me about this phrase. Firstly, the word ‘flap’ implies that it is this loose extra bit of skin that just flops around and gets in the way. The truth is that it is not a ‘flap’, but a tight structure that sits snugly all the way around the circumference of the glans. It has many functions, including a sophisticated ‘gliding’ or ‘rolling’ mechanical action during sexual activity – something that is difficult to explain to a generation of Australian men and their partners who have never experienced sex as nature intended it.
Futher information on the function of the foreskin can be found at the following link: