Fallon, a successful author and former TV producer, stated on the Second Act podcast that she has no regrets about not becoming a parent.
She explained her choice was due to her 'catastrophist' nature and anxiety, believing she would stifle her children rather than allow them independence.
Fallon concluded that she felt she would be a better auntie to her nieces and nephews and friends' children than a mother.
Both Fallon and Gervais, who met at university, have also previously discussed their mutual decision not to marry, deeming it unnecessary for their relationship.