Oh Tabbycat, that's terrible! Poor you.
In my opinion, that's no gentlemen and I actually think your reaction was very restrained. I would have instantly terminated the appointment, although at least your calm approach meant the photos were deleted with the minimum of fuss.
Getting "carried away" is one thing but the guy was intentionally deceiving you while you were in a vulnerable position. it's totally and utterly disrespectful.
Look at it this way; he knew that you didn't allow photos so slyly engineered a way to do so without your consent. What's not to stop him doing it again using more sophisticated methods such as a hidden camera?
I've had clients in the past that are so charming yet are actually behaving appallingly. It sounds to me that he was getting gratification out of "having one over on you". Yuk!
If it was me, I wouldn't dream of seeing him again.
All the best,
Spangle xx