The film draws on research that reports married women, on average, tend to have notched up ten partners, but when the number tops 20, a woman’s chance of tying the knot recedes.

The notion of a perfect ‘ten’ was reinforced recently when a new study revealed this was the figure both men and women believed to be the correct answer to the thorny question regarding past loves.

Fewer than that number was felt to suggest a regrettable lack of experience (and also, possibly, of desirability), while many more ran the risk of appearing promiscuous.