Yeah I'm thinking now that Esmenet was raped by the bird-Synthese. And honestly, given certain real life avians, a giant (relative to the body that possesses it) extrudable penis isn't actually that weird or implausible. And is exactly the kind of thing an Inchoroi would make sure its vessel had.
I very much like this line of reasoning. Regardless of what the synthase was/is and/or how it was made, the certainly would have made sure it had the proper gear.