Beenthere, in my sphere of experience, the longer we are together, the more difference it makes.
Early on in our relationship, (and still, when she has her period) she didn’t like it too deep. She said it gave her a painful jolt (ie I was whacking her in the cervix) Back then, she didn’t enjoy the sensations much. I guess that was mostly because she wasn’t very experienced, but it irked me that my penis was only “pleasant” for her.
Nowadays, though, she will usually cum, or at least be very turned on BEFORE penetration. (clitorally) This way, she can take the best part of me, and she says at the deep part of every thrust is a “mini-orgasm”. Much improvement I would say. She loves for me to sink in really slow unti I hit that deep spot, then pull out again and sink in really slow again :D
She still can’t cum from that alone, she needs at least a little clitoral stimulation, but the pleasure sources are switching places from her clit to her deep spots.
If I try to go shallow, she will pull me in deeper, every time (with the exception of period time etc)