Especially in postal questionnaires, Hite sent out 100,000 questionnaires to Americans regarding 'love, passion, and emotional violence' (this is socially sensitive) but only 4.5% were returned. Higher response rates are only obtained if follow-up questionnaires are sent, but this increases time and money, so often inaccurate generalisations are made- as only those highly passionate or those who live untypical lives respond; distorting the representativeness of data.