Finishing quick

My boyfriend is always saying how he feels bad for finishing quick even though I tell him everyone’s body works differently and not to be embarrassed about that. So, I was wondering if anyone else’s significant other has this “issue” and if theres any specific steps to making them last longer. I personally don’t find it much of a problem and I tell him that but if him lasting longer makes him feel better about himself then maybe giving some suggestions a shot will be helpful.