I can suck the head of my penis and have done this with four girls, and discussed it with a fifth.
Girl 1: Was quite neutral to it, she continued sucking me at the same time and never commented on it.
Girl 2: She sucked me in the sauna and i also went down. She said afterwards: "Wow, that was pretty hot", but never asked about it again.
Girl 3: Said "oh, i've never done that before", but seemed neutral.
Girl 4: Was quite shocked, and thought it was a bit nasty.
Girl 5: (during conversation) was very impressed when we talked about it. She never saw it though.
So, apparently the reactions vary. My general impression is that it doesn't in fact turn on girls, they can be curious and impressed at best.