... conducted on HIV have usually been based on homosexual men, injecting drug users, and prostitutes for example, Winkelstein, Lyman, Padian, 1987) This is not a cross section of the population, and so does not tell us a great deal about the spread of the HIV virus. It is a specific sub-group, which is expected to be of a particularly high risk because of their lifestyle, and so can not be used as a measure to assess the general population's behaviours and the findings generalized to the wider population (Cochran, Mostelier, and Tukey 1953). When conducting a large scale survey on peoples sexual lifestyles several important things need to be considered. One of the main studies to be conducted was that by Wellings, Field, Johnson, and Wadsworth (1994) on sexual behaviours in Britain: the national study of sexual attitudes and lifestyles. The study came about as a result of an emerging HIV ...

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