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  • Written by Francisco Perales, Senior Research Fellow (Institute for Social Science Research & Life Course Centre) and ARC DECRA Fellow, The University of Queensland
Who identifies as non-heterosexual varies on who, what and when you ask. AAP/Joel Carrett

Almost two years after the heated discussions accompanying the 2017 marriage equality postal survey, LGB Australians remain at the centre of public debates. For example, there are ongoing issues around religious freedoms, and homosexuality was at the centre of Israel Folau’s controversial statements.

But one aspect about the Australian LGB populations that is often ignored is who, and how many, belong to them.

In fact, there is a large degree of uncertainty internationally about the share of the non-heterosexual population. The accuracy of early US studies by Alfred Kinsey has been largely discredited. More recent work by demographer Gary Gates provided more robust information, but left many questions unanswered.


Read more: Marriage equality was momentous, but there is still much to do to progress LGBTI+ rights in Australia


In Australia, there is comparatively less information – notwithstanding recent research efforts. Understanding the prevalence of non-heterosexuality — as well as how this varies according to who, what and when we ask — is an important endeavour.

It can contribute to more inclusive social policies and services. It also allows us to reflect critically on traditional narratives about sexual orientation and their applicability to current debates within Australian society.

Here, we collate and discuss estimates of the prevalence of sexual-minority status in contemporary Australia, leveraging recent information from several major social and health surveys.

Dimensions of sexual orientation: what you ask

Academic scholarship usually distinguishes between three dimensions of sexual orientation: behaviour, attraction, and identity. These lead to different definitions of non-heterosexuality:

  • engaging in same-sex sexual behaviour;

  • feeling some degree of sexual attraction towards people of the same sex; and

  • self-identifying as lesbian, gay, bisexual, or other smaller sexual-orientation groups (for example, asexual, pansexual, demisexual).

Few Australian studies collect information on the three domains of sexual orientation from the same sample. But those that do provide an interesting picture: the prevalence of non-heterosexuality varies drastically depending on the domain asked about.

Take, for example, the Australian Longitudinal Study on Women’s Health, a long-running health survey tracking several cohorts of women over time. Its youngest cohort, comprising roughly 17,000 women, was asked about sexual orientation at ages 22-28 years in 2017. When sexual-minority status was defined on the basis of identity, 38% of these young women fell into a category other than “exclusively heterosexual” (that is, “mostly heterosexual”, “bisexual”, “mostly lesbian” or “lesbian”).

However, the “mostly heterosexual” category accounted for the bulk of this figure, and some might question whether these women should be counted as non-heterosexual. Excluding the “mostly heterosexual” category, the share of sexual-minority women falls to about one in eight (12.4%).



If sexual-minority status was defined using same-sex sexual behaviour (having had sex with other women at some point of their lives), about a third (32.9%) of the young women in the study would fall into this group. Yet only 3.7% of them reported that their sexual experiences with women were at least as frequent as those with men.

Finally, 43.5% of women in this sample acknowledged feeling some sexual attraction to other women. But again, a more conservative measure — feeling as intense a sexual attraction for women as for men — reduces this statistic to 1 in 10 (9.9%).

Interestingly, the degree of overlap between measures is not as large as could be expected. While 52.9% of the young women reported some non-heterosexuality on at least one dimension (identity, attraction or behaviour), only 23.4% did on all three dimensions.

Gender differences: who you ask

Some surveys ask sexual-orientation questions of both men and women, which allows comparisons by gender.

The Household, Income and Labour Dynamics in Australia Survey, for example, asked a sexual-identity question of approximately 16,000 men and women aged 15 years or older in 2016. A greater share of women (1 in 25, or 3.9%) than men (1 in 33, or 2.9%) identified as gay/lesbian or bisexual.

However, these figures are likely to be underestimated, as 6.1% of women and 4.8% of men chose uninformative response options – “other”, “don’t know”, and “prefer not to say” — which suggests that many of them may not be heterosexual.

Estimates of non-heterosexuality from the 2014 General Social Survey for the Australian population aged 18 years and older are slightly lower, at 2.5% for women and 2.4% for men.



The Longitudinal Study of Australian Children asked a sexual-attraction question to a sample of about 3,500 boys and girls aged 14-15 years in 2014. In this youth sample, 1.2% of girls reported feeling sexually attracted to other girls exclusively, 4.4% feeling attracted to both boys and girls, and 4.4% being “unsure” about their attractions.

Among boys, 0.4% reported feeling sexually attracted only to other boys and 2% to both boys and girls, while 1.7% were “unsure”. Therefore, as for the adult population, more adolescent girls than boys fell into the combined sexual-minority category — 1 in 18 (5.6%) compared with 1 in 42 (2.4%), excluding the “unsure” group.



The higher propensity for women (and girls) compared to men (and boys) to fall into the sexual-minority group has also been observed in other countries, such as the US, and attributed to lower acceptance of male than female homosexuality and greater erotic plasticity and sexual fluidity among women.

Sexual fluidity: when you ask

This phenomenon of sexual fluidity gives rise to other fascinating statistical patterns surrounding the prevalence of non-heterosexuality. For example, our recent research demonstrates that women’s sexual orientation should not be assumed to be static.

Rather, some women experience shifts in their sexual orientation over time, responding to changes in their personal and social circumstances. Thus, the prevalence of non-heterosexuality also varies as a function of age and life-course stage.

We used Australian Longitudinal Study on Women’s Health data to track a cohort of women born between 1973 and 1978 from ages 22 to 27 years in 2000 to ages 34 to 39 in 2012. Approximately one in eight (12.5%) changed their response to the sexual-identity question on at least one occasion. The most common changes involved movements from “exclusively heterosexual” to “mainly heterosexual”, and vice versa.

However, the results were very different when we repeated this exercise using data from a younger cohort of women, born between 1989 and 1995 and followed from ages 18 to 23 years in 2013 to ages 22 to 28 years in 2017. Approximately one in three (32.8%) of these young women changed their response to the sexual-identity question at least once. The most common changes involved moving away from the “exclusively heterosexual” and “mainly heterosexual” categories.

Societal change

Less is known about change over the time in the number and share of Australians who are non-heterosexual. This is because most data collections only began asking about sexual orientation in recent years.

Estimates based on the 2001/2002 and 2012/2013 instalments of the Australian Study of Health and Relationships (each canvassing about 20,000 men and women age 16-59), suggest an increase in the prevalence of non-heterosexuality across different measures.

The share of men identifying as homosexual or bisexual went up from 2.5% to 3.2%. The share of women identifying as lesbian or bisexual also rose, from 2.2% to 3.8%. While the share of men expressing some same-sex sexual attraction increased slightly (6.8% and 7.4%), this increased more markedly for women (12.9% and 16%). Similarly, the prevalence of lifetime same-sex sexual experience increased for both sexes, with the increment being more pronounced among women (8.5% to 14.7%) than men (6% to 6.6%).



Similarly, Australian Census data suggest a marked increase in the number of same-sex couples — from about 10,000 in 1996 to about 47,000 in 2016. The 2016 figure means that, on that year, approximately one in 100 Australian couples was a same-sex couple.

What does it all mean?

The variability in estimates of sexual-minority status according to who, what or when you ask might come as a surprise to many. It also casts doubts over traditional “us and them” narratives about sexual orientation.

Using certain definitions, Australian sexual minorities appear in fact pretty “major”. While only one in 25 Australians identify as gay, lesbian or bisexual, feeling some attraction to members of the same sex or seeing oneself as “mainly heterosexual” is fairly common—especially among women.


Read more: Australia has finally achieved marriage equality, but there's a lot more to be done on LGBTI rights


Which of these indicators of sexual orientation is a better predictor of life outcomes in contemporary Australia? How does structural stigma affect these different groups? Which domains of sexual orientation should we ask about in official statistics? How should we ask these questions to elicit accurate and unbiased responses?

More broadly, the nuances here serve as an important remainder of the complexity of human sexuality. Large-scale quantitative studies have only scratched the surface. More information on, for example, less socially salient but clearly emerging sexual-orientation and gender-identity groups (for example, asexual, pansexual, demisexual, transcurious, and bigender) is needed to fully map gender and sexuality in our society.

Then we can better understand how these personal traits contribute to shaping the lives of everyday Australians.

Francisco Perales receives funding from the Australian Research Council as part of its Discovery Early Career Researcher Award scheme for a project titled 'Sexual Orientation and Life Chances in Contemporary Australia'.

Alice Campbell does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

Authors: Francisco Perales, Senior Research Fellow (Institute for Social Science Research & Life Course Centre) and ARC DECRA Fellow, The University of Queensland

Read more http://theconversation.com/how-many-australians-are-not-heterosexual-it-depends-on-who-what-and-when-you-ask-118256

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