Quote: Do you think that your H is afraid that if he doesn't start out a sexual encounter fully aroused that he won't get aroused?
No, he is willing to put himself out there when he's not aroused.
Quote: Does he have the ability to relax and let his arousal happen as it will?
Yes he does...I am the one who gets all tense.
Quote: What if, even given his and your best efforts, arousal just doesn't happen?
This happens but infrequently...usually he will get there, or there enough for penetration. If it's not happening, I will make some comment about trying agin the next day, which will get him going. My H, if he were a racehorse, would be a good come from behind/closer type.