If the Kinsey Scale teaches us anything, it's that a tiny percentage of people are actually "Straight".
I'm probably somewhere around here: STRAIGHT --------X------------ BI --------------------------- GAY
Plus, there really are two different scales: hetero/homo sexual, and hetero/homo romantic โ i.e., someone might jerk another guy off, but wouldn't necessarily want to snuggle or go antiquing together.
Basically, sex is a big messy pile of consensual fun, so