Does it reflect some kind of self hatred, or a desire to have someone else in charge? Rather, people might relish the idea of giving up control, but if faced with the exact situation in real life, might not want it at all.

In many ways, being submissive in your fantasies is the ultimate control: when it's in your head, it can't ever go further than you want it to.

For others it's the possibility of having sex with both a man and a woman at the same time, or the totally anonymous nature of some group sex acts.

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While discussion of women and sex is never far from the headlines, what do we really know about female desire?

What -as the famous question goes - does a woman want?

She can be exactly as she wants to be, and that may or may not conform to the busty, PVC-clad type we've come to associate with dominating.

This is a fantasy that centres mainly on the woman receiving pleasure, and she doesn't have to have chains and whips to hand in order to get it.

In the same month as My Secret Garden’s release, Cosmo ran a feature with the opening line: “Women do not have sexual fantasies, period.

Men do.” Nancy Friday's book changed that tinting, and within a year Erica Jong's Fear of Flying (the book that spawned the wonderful phrase, a 'zipless f***') appeared.

Group sex fantasies often overlap with the preceding categories, or can have no dominant/submissive or exhibitionist aspects.

For one respondent the idea of being 'very stimulated' - more things going on simultaneously than normally happens during sex - is part of the allure.

Submission might be strict obeisance of orders, or more emotional than physical.