When my girlfriend and I have sex I can always make her cum from the front and squirt at the same time but when I’m fingering her from behind it more difficult and almost impossible.. Any advice?

It’s all about the angles! You have to be able to hit the right spots and doing it backwards changes up your whole thought process. You’re used to doing it the way that has proven “successful” and now you rely on that too much.

You have a routine but that can also be seen as a rut when it comes to sex. You have to change it up, try hitting different places until you find what works the same as it does when you’re fucking her from the front. Experiment. Maybe try some toys. Point is, you can’t do the same things when you’re in a different position. You have to adapt!