From personal experience, I have to disagree to some extent. NFP still works with the premise that there's something wrong with women, because when they have sex, they often have babies after a while. Men have sex, whenever, and never have babies. Therefore, male sexuality is the default, and female sexuality is aberrant.
I can't agree with at, though. I think NFP can be kind of nerve-wracking, at least at some time, for many couples, and I wouldn't do it at all unless there was a good reason why a pregnancy would be bad news (medical, financial, every-body-is -at-the-end-of-their-rope-and stuff-is-falling-apart reasons.
O conversely, using NFP to achieve pregnancy: unless here are actual subfertility issues I don't think you usually have to make an effort to "achieve."
I think normally, people should act normally. And normally, you just have your blessed sexual relations when you blessed-well feel like it, and come-what-may.
My two cents' worth, adjusted for inflation.