In "Hills Like White Elephants" why are they going to Madrid and why do they refrain from speaking about it explicitly?

The man
and woman in the story are going to Madrid in order for her to have an abortion. This becomes
apparent in the dialogue because the man keeps trying to reassure her that it will be a very
simple operation. He says: "I'll go with you and I'll stay with you all the time. They just
let the air in and then it's all perfectly natural." At this point there can be no doubt
that the trip is for procuring an abortion.

They refrain from speaking about
it in explicit terms for a number of reasons:

1. She is...