What about oral sex makes your uncomfortable, was it the way you were raised, are you not sure about what your doing or if your pleasing your mate, does sex in general make you uncomfortable? What about having a penis in your mouth makes you uncomfortable to begin with? I personally love oral sex giving and receiving however what is a turn about it for me is that well for most men not all it brings them great pleasure and it's a huge turn on to have that affect on your mate. However it may simply be that you dont want him ejaculating in your mouth and there are ways around that but to be quite honest you need to pinpoint what about it you don't enjoy and work from there. If it's a cleanleness factor then bathe togather before hand. And well if it comes down to it and you just don't like it altogather then forgo it. I mean you have to be honest with yourself and your mate and if you do something you do not want to your entire relationship it will only become a bone of contention, however prepare for it to be a bone of contention on his part as well that he's not getting what he wants. But above all be honest with your self.