For what it's worth, here is a quote from my latest book (blush!).

"I suppose there are men who don’t like to give their women the fun of oral sex, although I can’t say I’ve ever met any. Let us suppose such a man exists, what should be his attitude? Should he say my woman wants it so I must give it to her, or on the other hand can he say I don’t like the idea so it’s out of the question? Difficult, isn’t it? The truth is, of course, that most of us live in the gray area in between. We don’t particularly like something, or it’s boring or difficult, but because our lover enjoys it we’re prepared to go along. We enjoy our partner’s pleasure, and are hopeful that our compliance will be rewarded by something nice in return.
No one is going to say that you must let him come in your mouth, but think about what exactly he is asking you to do. Even at his hungriest, he is only going to produce a teaspoon or so of come, so you are not going to drown. It doesn’t taste completely revolting – you’ve taken medicine that is far worse. And it’s not going to poison you. So any uneasiness you might have is just about the idea of it. Some people won’t eat prawns or avocado because they don’t like the idea or the feel on their tongues (and that just makes them taste all the worse). If they can’t enjoy prawns and avocado, it’s their loss and there’s more left for the rest of us. But if you can’t give your lover a complete blow job, it’s his loss.
Most couples arrive at some sort of compromise. Some moral and very strong minded women actually refuse oral sex on themselves because they don’t want to suck their men to completion – that really is a case of throwing the baby out with the bathwater. Many women seem to give their men some fun until they are ready to come, and then finish them off either by hand or with their pussies. Don’t feel embarrassed if you are one of these. No one is being judgmental – except you yourself, of course.
If you are being self-critical, for once I have to agree with you. Imagine: you have been working hard at him, putting all you skill and heart into bringing on an agonizing, ecstatic orgasm, and at the last minute what are you going to do? You’re going to take him out of your hot, wet, inviting mouth and point him at the ceiling? What sort of message does that send? He’s your man and it’s his come he’s giving you. You can reject it, of course, but do you really want to? He doesn’t particularly want you to swallow it, but he does want to be inside you when he comes. If you had a cock, wouldn’t you feel the same?
Practically speaking it’s difficult to refuse, so what are you going to do? One strategy is to make sure he is well back in your throat as he comes. A quick swallow, just like taking a pill, and the problem has gone. If you don’t like to do that, just hold it in your mouth. Once he has finished, turn yourself around and share it with him in a big kiss. This is called snowballing and has the advantage of being very politically correct. Or you can just let it go, drop it on him or the bed sheet, where ever and wipe your mouth with the corner of the sheet. Don’t make a big deal of spitting it out; that’s rude and bad manners. It’s also very rude to run to the bathroom and gargle mouthwash. This sort of behavior is not lady-like so don’t do it!"