Because based on the size of most Qunari, I think it's fair to assume their penises are probably larger than humans or Dwarves and it may cause some uncomfortable or painful sex for anyone who isn't also a Qunari.
There, I said what everyone was thinking. You're welcome.
We've covered this topic many times. Even Allan has weighed in on it.
No, being a bigger man will not guarantee a bigger dick. No, penis does not scale to species. Gorillas are 300 pounds and have 1.5 inch long dicks. Humans have the largest of any primate in both total size and proportional to their body.
Yes, there is a very, very popular sexual fantasy involving large men and smaller women, and browsing the kink meme, you'll see a bunch of erotic stories where a giant qunari splits a human/elf/dwarven partner in half. But DA lore is not based on fan kinks.
Gorillas also have bones in their penises, but we ain't talkin' about gorillas, lol.
A bone in your penis would actually help with having a larger size as an erection wouldn't require the same complex fluid engineering.
Since others have already compared gorillas and qunari and brought out the hyenas as is traditional...
Hey now, this party doesn't start until I get here!