Because it would look ridiculous with 8 inches.
Couple's Daily Question Mug
Coffee Mug
Because they've been lied to all their lives about how long "8" inches is.
Because they've been lied to about what 8 inches look like their whole lives.
Because for years men have telling them that ---------------- is 8 inches long.
A: 6 inches is medium 8 inches is rare.