Over the years I have come across some women who just do not want any mouth action anywhere near their genitalia. Fair enough, its their prerogative. On the other hand, as posted here, if you know what you are doing, I would say most are very responsive to daty. Its an orgasm after all and can be pretty magnificent in all its earth shaking thundering glory!!
Regarding SP's we have all experienced the moment when we were ready to dive into that muff and got a hard stop. Well thats the business side of this and again fully the SP's prerogative. So what I do if its worth anything, is I ask before things get going if my SP of the moment would like me to provide oral. If I get a green light great and I can then do what I can to get to that screaming O. Receptive SP's though, I don't have enough stamina in my typing to list them all.