Sable Phoenix wrote...
Argh.
>rummages around through notes<
Ah, here we go. Originally part of a different discussion, but applicable here.
Well, since asari breasts serve the same function as they do in humans, I'd imagine them to be similarly sensitive, and be at least a semi-erogenous zone.
I imagine that the folds and other structures on the backs of their heads under the fringe are pretty dang sensitive. I've assumed that there are lots of extra nerve structures in there to facilitate their melding, since they need to "become a single unified nervous system" with their partner according to the codex.
Since asari reproduction does not, evolutionarily speaking, involve any kind of sexual penetration, I'd imagine the "azure" has nothing to do with the area between their thighs, the way most people assume. I doubt that area is an erogenous zone, period, or any more sensitive than any other area (heck, if its only function is as a birth canal, then it's highly likely that it's less sensitive than other parts of the body, cause childbirth is just not very pleasant by all accounts). If the "azure" was what Shepard touched in her cabin after LOTSB, it seems to be located over the tailbone just above the gluteus muscles. Which would also make sense, with the asari having highly developed nervous systems and that being a nerve cluster even in humans.
In order to induce actual fertilization, I've imagined that there's also an erogenous zone on the front of the asari body, low on their belly just above the pubic bone (possibly extending up to the navel during arousal). This area would probably need to be stimulated at the same time as the one on the rear to induce fertilization. This could be the "azure" as well, or perhaps "azure" refers to both simultaneously.
I figured that sometime in their evolutionary past their reproductive cycle became symbiotically linked to certain kinds of bacteria, much like the Wolbachia bacteria does in certain species of wasp here on Earth. The nervous system must pass current through both the rear and front of the azure to stimulate them to induce fertilization of the asari egg cells.
I do love how we all think about this so ... deeply

.
Truth be told, being that I'm a member of the refugee group that formed off of a Liara group that splintered into femShep and maleShep factions, for the most part, and said group is the femShep one, I've heard an awful lot about how asari really shouldn't be interested in birth canal penetration, at least by standard evolutionary design. (I was almost disturbed by how vehement one or two of the male participants in the discussion were that such an act would probably be uncomfortable, even
painful, to asari, but then again I am much more of a self-insert than others in the group, as Alyna and Anya Shepard both have significant information from she-who-is-typing's worldview, which is not a problem Nate and Neate seem to share. So the fact that they willingly disqualified themselves from being suitable partners if Liara really existed is actually an admirable response on that level. If still weird to me.

)
The problem is, I must say nature itself doesn't always make much sense. Why does stimulation of the breasts cause a response at all? There's also the 'fifth base' problem to consider -- there's no evolutionary reason for that to be any sort of interest to a female, or a male, yet because of a happy accident of existence, it actually is considered a legitimate source of pleasure to some people. Said 'azure' could be close enough to the birth canal in asari to provide the same 'happy accident'. (Then again, it could be better suited to
Turian-based stimuli, which Garrus fans and Garrus detractors alike have suggested is nothing like the equipment of a human.)
The major issue of course, is that this will most likely
never get a Word of God clarification to it. Unlike Star Wars and Star Trek, this is a video game franchise, and one that is made by people likely (in my eyes, based on recent observations of behavior of the company) chastened by its appearance on Fake News sufficiently to not want to ever draw attention to the fact that sex exists in the universe of a game. We'll just have to make do with our reasonings.