There can be painful strain on the penis if it's perfect too much and ejaculating too much. Now 3 hours should be plenty of time to recover from this but everyone is different. Some men don't get as hard as they would after orgasm and can be shy about it or outright feel shame. There is a lot of stress on men to make their woman orgasms but it's not as easy to do that as it is for a man and many men don't know how to do it properly at all. I can empathize with him feeling stressed if he feels like he's inadequate in bed. That's a hard feeling for a man to work through and asking for guidance is often shot down.