I actually went to the penis museum 5 years ago! It was... maybe not the best thing. It's not exactly clear in a lot of the marketing materials, and even once you arrive, that it's just a single room behind the front desk. It felt a lot more like a road side attraction than anything else. The gift shop in the front was a similar size to the museum in the back.

To be fair my expectations of a penis museum weren't THAT high, and it was still funny to go and get pictures! But that's about all the experience really is.