Australians worry the most when it comes to weight and how it affects our sex lives, a new global survey has revealed.

Half of us say we care much too much about our waistlines, but at the same time we secretly wish our partners would lose a few kilos.

A global survey reveals what's really on our minds. Credit:iStock Photo

A majority of Australians have tried to lose weight at least once - unsurprisingly women more than men - and about 40 per cent of us feel constant pressure to be thin.

There's also a fear that being fat could affect our performance at work.