There are no direct prohibitions concerning oral sex in marriage in the Bible. Again, God's parameters are wide when it comes to sexual exploration in marriage. I would refer to the previous answer concerning mutual agreement and respect when it comes to deciding on specific sexual activities in marriage.
Addendum Question
Question: I am a Christian, but my wife is not. Is oral sex a sin? I don't want to do it, but my wife wants to do it. I don't know what to do.
Answer: There is nowhere in the bible where oral sex is specifically prohibited for married persons. So, the act itself is not necessarily a sin. What concerns me most about your question is the differences in preferences and desires between you and your wife. God created sex for several reasons, one of which was pleasure. God really does want us to enjoy our sexual relationship with our spouse! In order to fully enjoy your spouse, however, you must engage in mutually agreeable, pleasurable, and moral activities. Since there is no moral law against you and your wife engaging in oral sex, you must then work out whether it is mutually agreeable and mutually pleasurable. Otherwise, it is best to abstain from such an activity.
One other reason God created sex, which underlies the issue you are facing, is that He designed the sexual union to be part of a couple's deepening intimacy. God even states that the marriage union is symbolic of Christ's union, or intimacy, with the church. Therefore, if sexual contact in your marriage is not ultimately moving you toward greater intimacy with your spouse, it is best to take a step back, talk with your spouse, pray and fast, come to agreement, and then move forward with the agreed upon sexual activities.
Remember, the basic questions for developing great, intimacy-building, sex in marriage are:
Is the activity moral? (i.e. Is it acceptable to God?)
Is the activity mutually agreeable? (i.e. Do both you AND your spouse want to engage in the activity?)
Is the activity mutually pleasurable? (i.e. Does the activity bring pleasure to BOTH you and your spouse?)
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