Head Holding During Head
While in porn it’s typical for the men to hold a woman's head, forcefully shove themselves deeper down their throats and even pull their hair. These women are actors and not every girl will be into this. As a rule ask before you do it, especially if you’re into being rough. Otherwise a light guiding hand is fine, and of course, at the climax, you may want to hold on.
When it is ongoing it begins to limit movement. Not allowing a lady to move around and switch directions at their will limits their movement, literally. Rather than holding onto her head while shes got your member in your mouth, or worse pushing her head down further, maybe try touching her everywhere and elsewhere, or sit back and let her do the work.
There’s nothing wrong with being engaged (in every sense of the word) but sometimes it’s best to sit back and enjoy the ride.
You’ll know when to hold on.