say when a female is giving oral to a guy then he is fingering her ( not eatting her ). when you lay down in the sand it feels good when your penis is in the wet sand ( her mouth ) then your fingers are playing in the sand ( her vagina) its not the 69 it's the sand box.
did you and her do anything last night ? yeah i sand boxed her !
its like the 69 but your not giving her oral.