“I always wear some clear nail polish that strongly fluoresces. When I’m outside and I see some blue on my thumb, I know the
UV index is high and it’s sunscreen time.”
“In the photo, I shined a UV flashlight on the nail polish to exaggerate it. In reality, there is a slight blue tint.”
This is technically correct. Observing beautiful things like art, landscapes, women, etc. is chemically stimulating to the brain. Even more so if it's also sexually arousing.