I'm female and I give my male partner much more oral than I receive. Sometimes I give him oral and go to sleep with nothing more than that. It doesn't bother me much, as long as I receive occasionally too.
My wife really enjoys going down on me, just as I love giving her pleasure. I think it is more skewed towards my being the recipient because she needs to be in the mood to receive, whereas she can ALWAYS get me in the mood. I am indeed a lucky man.
It's probably close to 50/50. But, I think he spends more time on me than I do on him, because I take longer to come. He doesn't mind. Of course, there are those "Ninja Blow Jobs" where I'll grab him somewhere and just go down on him and then coolly walk away after he comes. So, it evens out.
Wish it were closer to 50/50, but my wife is very particular about when she wants me to give her oral. Usually happens 5 or 6 times a month. Wish I could do it more. Rarely does she receive and I don't, and other times I just receive.