I had a similar issue. After a trip, one of the people in my group wanted me to upload all my pictures from my camera to her laptop, before I'd gone home and looked at them myself and sorted them. I really didn't want to do this. Not that there was anything private, or that I didn't want to share; I was happy to share them, once I'd sorted them! But she was quite persistent and wanted it right now, before we'd even got home.
The issue for me was that on the trip, I'd gone off on my own plenty of times and played around with various settings on the camera (which I'd only recently acquired), tried this, tried that, taken a zillion shots of the same scene, using slightly different angles and settings, tried various nature shots with different lighting, and so forth and so on. I can't really pinpoint why, but I felt very uncomfortable uploading the entire collection of unsorted and unprocessed images onto her laptop.
Like, I'll share, but let me go home and sort them out first!!! (And I promise not to delete any of the ones of her that there's a possibility she might want!)