Much, much easier. My hubby is insanely busy with work, and if we can cluster our BD-ing to around my O-date, so much the better. He needs to plan sex and have it scheduled into his mental-day-timer.
He came home Friday night and I tried to jump him, only to be rejected because his father was on his way over to help draw up plans for finishing our basement (and it's a really good thing his father was on his way and didn't actually come home with him).

He has the link to my chart, and while he totally doesn't understand everything, he knows a dip followed by a sustained rise is a good thing, and we need to have sex before or on the day of the dip, and as much sex as possible around that dip.