when i first did it, i didnt no it, i just mm'ed while doing the deed and i was told not to stop. so i guess they like it?
(I hope my door doesn't get broken in by the Man for telling teenage girls about bj's) Anyway, yes, humming is usually good! We can feel those vibrations, it's a nice little "extra". And we like it when you really get in to it! Makes us feel appreciated. Humming is not required, by any means, but it doesn't hurt! Some dudes may not like it...but I'm sure they will let you know if they don't! OK, hope that helps answer your question.
