I don't know. If someone is very shy and thus doesn't have much of a social circle, it is possible that they don't know anyone who is homosexual.
If, in the absence of evidence to the contrary, they assume that everyone is bisexual, then they might say that they don't know anyone who is gay or straight.
This is very creative quoting I have to say. It is accurate that I used "over-representation" a few times but it would be even more accurate to say that I always used the words "disproportional over-representation".
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Unless I'm terribly wrong, what you want IS disproportional over-representation of LGBT people. So no need to assume anything about me for simply stating a fact
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There are some significant issues with any attempt to use statistics to determine representation status of sexualities in media.
1. The actual numbers of people of varying sexualities in the general population is unknown. Apparent sexuality =/= actual sexuality, and there is a great deal of social and religious pressure on people to present themselves socially as straight.
2. Sample size in most media is insufficient. If a work of fiction included literally thousands of characters, it would be much easier to provide representation more reflective of actual population numbers. Furthermore, characteristics such as sexuality cannot always be immediately or accurately determined. You might, for example, assume that the de Launcets are all straight, but the game does not provide enough evidence to assure this.
3. Thedas is a fantasy world. It has elves, dwarves, qunari, darkspawn, dragons, and a lot of other things that we do not have in our world. The numbers of people of varying sexualities in that world may be very different from ours.