RE:Appreciation for what happens naturally

... she let me go to the restroom to calm it down. ...
"let" you, or suggested you might want to take care of your troublesome appendage in the restroom?

She wasn't uncomfortable with it, as it doesn't mean you want sex
If she wasn't "uncomfortable" with your waving flagpole, most likely she would have said - Why don't you just knock the top off first, here and now. I understand it's just part of the natural uncontrollable process of being male?

If you're post puberty, erections don't just happen "naturally" - there is always a preceding stimulus, be it mental or physical.

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