It’s interesting that many more people say that donuts have a hole than washers or rubber bands. I guess donut holes have better marketing? As for straws — reason tells me they only have one hole but I know in my heart they have two.
There is very little defensible internal logic to my gut reactions, but here we go… Straws have two holes. Donuts have one. Rubber bands do not have holes, nor do loops on a knot. Cups have one hole; bowls and spoons have none. The letter “O,” and, importantly, the number “0” each have one.