Actually, before I told him about it, he almost caught me. I was walking out of a exotic store with a strap-on in a bag, I had parked around the corner, so people would not see my truck.
He saw me walking, drove up and said "what did you buy in the porn store" I made up some quick excuse about how my gf wanted me to get some edible panties, then he wanted to see them, and I had to refuse. I think he was a little suspicious about it. When I got drunk and told him all the things that my ex and I had did, he put 2 and 2 together, and figured out that I was buying the strap-on.
If it wasn't for bad luck, I'd have none at all.