Slightly NSFW) Because they get 8 more.
Mourning Sickness.
If you let the dog in, it will shut up.
When you drop a load in, it doesn't follow you around for 6 months trying to get spun. 8)
Eric Clapton would never let an 8-ball fall out the window!
Baby! Let's do a 69. Hahaha XD
Girl - Give me 1 good reason, why I should date you? Guy - I'll give you 69.
Because they're easier to get at the ballpark.
Ramadamadan.
Because you get ate more
Because it's eight more.