When I became a sexually active adult and out on my own I established 6 rules for myself, and I stuck with them. Rule number 5 was and I quote, "don't put your hands on my head because I don't need any help", meaning during oral sex of course. To me at the time it was degrading and I really don't like being choked.
It's amazing how we change and evolve over time though. Because one of my greatest desires is for the BF to first of all, TELL me, or demand that I pleasure him orally, and then for him to take total control of me and put his hands on my head, or hold on to my hair. Mmmmmm, that to me so super freakin hot !
I love doing the oral thing as it is, it's one of my all time favorites, and having him in control by doing to former would just make it all that much better.
However, I am still trying to convince him to do it. He is currently of the mindset that him asking me would be degrading and disrespectful to me. I have told him a thousand times that it is something I want, so he is working on it.
The last time I had him all tied up I made him beg me for oral, lol, not quite the same as him demanding it on his own, but it's a step closer, and hearing himself asking for that was a baby step in the right direction.