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Being given gifts in return for sexual favours isn't necessarily the hardnosed horse-trading it appears, given that plenty of the women surveyed also admitted to having sex 'so that men will like them'.
Often, women who grew up fatherless or who have had chequered relationships with men find they have no blueprint for relating to men any way other than sexually.
You may feel shocked at the hint of prostitution - the bartering of our bodies for a bit of DIY - but within a committed relationship is it truly so different from any other trade- off which ultimately nets both participants what they want?
Women have always been practical when it comes to ensuring their comfort and security - and sex is an immensely valuable commodity.
'To be honest, I only slept with him out of politeness,' she admitted.
But once we've realised he's lacking in other areas or the passion has ebbed away, the reasons to have sex become far more mundane, or even acquisitive, such as 'So he'll take the rubbish out' or 'Because he took me for a meal'.
The key finding of the book is that men are, on some level, physically attracted to most women, yet women are left sexually cold by most men.
For most women, passionate desire languishes in the lower reaches of the list, somewhere below 'to get presents from him,' 'to shut him up' and even 'for fun'.
(It's striking that there's no mention of 'Because I was drunk', yet millions of men would testify to the fact that their chances sky rocket when a woman has had a few glasses of wine.) Given a choice, girls prefer tall men with symmetrical features and deep voices - which suggests the female sex drive is, above all, evolutionary, because they believe such men will provide them with healthy children.