Fieldwork for the third survey, Natsal-3, involved interviews with 15,162 adults aged 16-74 years between September 2010 and August 2012.

Natsal-3 comprised six interlinked work packages (WPs). These were:

WP1: Development phase

WP2: Core National Survey of Sexual Attitudes & Lifestyles

WP3: In-depth qualitative exploration of behaviours

WP4: Population-based measures of Sexually Transmitted Infections

WP5: Population-based measures of sex hormones

WP6: Web survey comparison study

The questionnaire used for Natsal-3 can be found here.