My man says he doesn’t nut from head

We just got together and I’ve always made my other partners nut from head so idk what’s the difference with him... maybe I loss my juice idkkk but I need help because I miss that power that I feel when I make my partner nut from head lol so any tricks if your man was like this? And can somebody educate me on what’s the difference.. why do some guys nut from head and some “don’t”