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Well, depends what you call a hole. Does a glass have a hole? Does a bottle have a hole?
If you said no to both, you mean a topological hole and a straw has one.
If you said yes to one or both of them, you mean a tight opening in which someting can be inserted (yes yes, innuendo). How tight an opening must be to be a hole is arbitrary and subjective, it depends on the person. In this case a straw has two holes.
Continuing on the innuendo: topologically a vagina is not a hole, but a butthole is.
You could argue that a hole is an entrance to a wider space. A door or window is a hole to a room. If you want to know the number of holes in a room, you would at least have to include all the doors and windows.
In this sense, the straw doesn't have a hole at all.
Or maybe it is just one hole.
Did not expect to learn that a butthole is topologically a real hole but I am here for it
I think the solution here is to have a way to measure the tightness of a hole (of which something can be inserted)
Maybe a cylinder