Why so many vibrators?

What's with this? I didn't know what to think when I found out my Narc had vibrators in all his closets. I understand one, a few maybe. But why so many? Seriously, there were over 20 different types in that house. And they had been purchased over the years. Some were newer, some were 5-10 yrs old.

I thought I was open-minded but I can't understand what is up with that.