18 NOVEMBER 1989, Page 26

Sexpert

Sir: Oh dear; the unthinking Establishment (science establishment) line (Scenes from science, 20 October). The most interesting thing about the trial surveys on sexual behaviour was that, like all others I have ever heard of, there was a, gross disparity between the sexes. One tria claimed that the average man enjoys 11 women, while the average woman only has three lovers; the other was not quite so extreme. Variouspersons, such as John Maddox seem to have accepted this ail: questioningly. But sex is a one to and activity between man and woman, an of there are approximately equal numbers each in Britain.

We are left with two possibilities. Firstly that about three quarters of British Ma sexuality is expressed outside Britain: Secondly, that the error produced by

11 survey of number of partners, let al°4 what they get up to with each other, is similar size to the result (and possibly eve larger).

If we wish to predict the progres

Tors of; disease (an exponential function) errrls e a fraction of a per cent will rapidly beconld overwhelming. Even were men, an w. o.men, not in the habit of lying about sex, women, information that any survey could genet, ate information of the necessary aeeura...civ. The trial runs for this one have ears shown that Margaret Thatcher apPears the have a better scientific brain than the editor of Nature, or the directors of t Wellcome Foundation.

P. G. Urben

2 Upper Rosemary Hill, Kenilworth, Warwickshire