Settle the debate… One or two?

Evidently there is a debate running around on Twitter... the twit machine, that is this- does a straw have one hole or two?

I say that there is one.  It's continuous, so therefore there is one.

The argument for two is this... there is an entry and an exit, so there are two holes.  Like a tunnel.  Nope- still one!!

One.  That's it.  That's my story and I'm sticking to it.