[Storyteller.]

I don't have any edits at the moment for the rest of the article, but with the first paragraph what I'm getting at is that I assume you mean methods like barriers/hormones can be that effective, whereas the behavioural methods are significantly less so. I just figured it might be worth making that distinction, otherwise you might give the idea that, say, pulling out can be up to 99% effective, while it's not really that useful. Does that make sense?