The bible does not say anywhere specifically that oral sex is bad.
The bible says that we are not to deny our spouses.
So whenever our spouse wants sex, even if we can't have intercourse (menstruating, ill, recovering from childbirth, surgery, actual place for intercourse not available etc.) a wife not only can but MUST give them satisfaction.
I have some problems with that. First of all, I find it fascinating when sola scriptura Christians (a doctrine not in the bible) demand that something has to be specifically mentioned in the bible! I found this link from Christian Answers (submitted in the comment boxes) to be very simplistic and also contained some false dilemma logical fallacies.
So for the sake of completeness and to represent the Catholic thought on the issue, I present the following links for educational and informational purposes.
Theology of the Body
I have a question - Catholic Answers Forums
Notre Dame Seminary
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