Also, tbf to the giver, how much your enjoy the thing can also fall a little, or entirely, on you.

If you can't get out of your head, are feeling awkward or thinking "she can't be enjoying this" etc. You numb your own ability to enjoy and actually feel the sensations.

I've had moment's where I couldn't get out my head and I was basically numb down there. Everything (teeth not withstanding), is too soft essentially when that is happening.

Then I've had other moments where every touch of tongue/lips feels incredible. And in both cases it had a lot less to do with the giver.

Asymmetric pleasure is not all bad. Going down on girls can be really fun. As long as you're a symmetrically providing pleasure then receiving it can also be nice.

That being said, for me half of my pleasure is seeing my partners pleasure so ideally they'd be masturbating at the same time.