only squirting when I'm on top

I'm 34F... my most recent partner made it a goal to make me squirt a few years ago and has achieved it. It's gotten to the point where it's just expected now and I love it, he loves it but it only happens when I'm on top of him? I try to emulate the feeling in other positions or even when he's fingering me but it just doesn't happen. It's weird? I guess it's not a huge deal... he doesn't care but I do 😂 any suggestions?