If you get the NSFW version of the Dark Horse comic book you have a ouple of pages that may apply.
Batou uses the Majors ghost key to pop in and ask her a question at a very inopportune moment. She hacks his arm and he punches himself in the face. But before the comedy there is a reference to him experiencing stuff that was utterly foreign to him.
I found an edited SFW version of one of the pages. You may have to hit refresh after you get the "no hotlinking" error message in order to view the image.
https://i.warosu.org/data/tg/img/0398/9 ... 370737.jpg
Zoom in, the text at the bottom of the page explains some. Shirow expounded in it in detail.
I could find no SFW version of the previous page. Essentially it represents a software encoder as a "glove" on Motokos hand and arm that digitizes and records stuff for their side business as porn vendors. I guess a government job doesn't pay all the bills even in GitS future?
I couldn't find any version of the next page (or two?) where Batou returns form the connection to speak with Aramaki.
I found this mildly amusing thing though
http://i718.photobucket.com/albums/ww19 ... _Mot-1.jpg
I guess the take away is that Batou was not equipped for what the input gave him. Wrong software drivers perhaps? I'm not sure what a lifetime of experiencing a body one way would do when an organ you've never felt input from before suddenly begins putting nerve endings on overload. Heck it might even come across as pain? The orgasm itself is all in the the mind, the rest of it is just body parts reporting stimulus through your network of nerves.
I found this afterwards. Long read
https://warosu.org/tg/thread/39893269
Do a page search for "priceless face" to get to a relevant part. That discussion forum goes ALL OVER THE MAP from RPG to ethics to characters. They even hit up Arise in there.
People tend to look at you a little strangely when they know you stuff voodoo dolls full of Ex-Lax.