I'm also pointing out that even in real-world medieval Europe, when people were dropping like flies, there were still entire classes of people whose existence was largely defined by their celibacy. No one was complaining that the existence of priests, monks, nuns, etc., meant that the remaining folks wouldn't be able to have enough babies to ensure social stability.
Gay people make up, by our best estimates, something like 4-8% of the population. Even if all of them are totally and completely gay and never once experiment or turn out to be bisexual, that's still not a large enough number to have any significant impact on the average birth rate. The incidence of gay people also goes up with a high birth rate - the more children a woman has, the likelier it is that her next baby will be born gay. And if a woman is having 5-6 children, things are probably okay as far as birth rates go. There's also some evidence that the occurrence of homosexuality increases as a response to urbanization and overcrowding. So, since there are a ton of gay and bisexual people in the DAverse, we can therefore assume that the birth rate is doing just fine.
Lastly, a lot of people reject the idea that their purpose in life is to settle down and have children. That life path isn't for everyone; and a lot of people are perfectly happy and find fulfillment without having children. So your core assumption regarding why it's permissible to 'question the homosexual lifestyle' is severely flawed.
First off, I'm glad that you're taking this seriously now. THIS is how conversation should be, not nonsensical claims that someone is thinking something that they've never said. I appreciate your response. Now:
I googled "percentage of homosexual relationships in Dragon Age" because I think that's an important consideration (because I don't think it's the same as RL, and that's what your argument is based upon), but couldn't come up with anything.
However, I came across
this, "Sexuality and marriage" on the Wiki. It points out something interesting:
"Same-sex relations are generally considered strange in Ferelden, but Fereldans do not consider it immoral, and place no particular stigma upon it. Orlesians regard homosexuality as a mere quirk of character, and the Antivan Crows show a winking tolerance for relations with multiple partners of any gender. The Chantry does not seem to have an official view on the subject, and nowhere in Thedas is it prohibited.[8]
There is pressure in certain circles, such as the elves and the human nobility, to marry an opposite-gendered partner, but this is motivated by pragmatism rather than morality; a homosexual couple cannot have biological children. For a dying race like the elves or dwarves, it is vital that every fertile individual produce offspring, and human noble families place great stock in the continuity of bloodlines in order to have clear heirs to noble titles and fortunes, and thus avoid the conflicts that often erupt when succession is not clear.
In Tevinter, same-sex relationships between nobles are largely hidden. These relationships are encouraged with favored slaves."
This implies to me that for an elf, dwarf, or human noble (of the which all our humans have been), procreation is important.
This is tangential to your argument, however. To address it directly, as I mentioned before, I'm not sure the ratio is the same as real life. It's a good argument, and I can't say I have a compelling argument against it, outside of that ^^, though I'm pretty sure there's a significant difference.
I personally have trouble with the idea that my purpose in life is to settle down and have children too. But I don't think it's unreasonable, at all, for the kind of world of DA.