Money is a constant concern for Jenny, so she likes that they don't have to pay anything to pull out. But she also know it only makes sense as birth control if they do it correctly. So far, so good.
It helps that they've been together a long time and are very open with each other. She's not afraid to remind him of what he needs to do. And he has no problem doing it. For them, it doesn't interrupt the moment; it's part of the moment. And the benefit of pulling out in time far outweighs the cost.
We don't think it interferes with the moment.