Most often, we're going to U.S. datasets. That's because they ask a wide range of questions, not only on sexual identity, which is what we have so far, but also on sexual behaviour, which capture another segment of the community that may not self-identify but that may be engaging in behaviour that has implications for health. There are also questions on sexual attraction, which are really the questions we need in order to understand issues for youth, who, as you have heard, have particular vulnerabilities. For youth who may not yet be sexually active or who may not yet have decided on a sexual identity, sexual attraction is really the only way we can tap into that population.
On February 28th, 2019. See this statement in context.