I can totally respect and value the fact that everyone has their own kink and pleasure (and that it is very diverse among gender, etc). I love and support all adults to be engaging in whatever consensual/legal pleasure they want.
Personally however, I am quite passionate (and I admit sensitive at times) about the long/hard road to sexual freedom/empowerment some women go through. We are sent messages our whole life about what our role should be in the home, in the work place, in society and definitely in regards to sex. In my husband and I's experiences, we have found that some men truly think that many things they see depicted in main stream/ professional porn is actually what women want. I do not feel that is accurate in most instances. I also think there are some women who view that, and feel as if that is what is expected of them in their role.
So personally for me, I will not allow a man to purposefully cum on my face. I am certainly not turned off by lovely, warms spurts of cum on my body (and even on my face if it occurrs). But for me, the intention of it feels degrading (regardless of what their intention is).