Guys love numerical rankings and arguing over differences in rank, and we apply our natural inclination towards women: thus the well-known "Hot Babe" (HB) scale, although fortunately most guys aren't so anti-social that they say "HB." She's a "7" or maybe "low 7" or "high 7," not an "HB 7," unless the guy is even more peculiar than the average guy likely to be reading this.