Married Oral Sex

Oral sex stories are featured in the Bible.  They are common in the Book of Song of Songs. Each of these passages uses the sexual language of the day, but most commentators believe these passages are talking about oral sex in marriage. Song 2:3; Song 2:16; Song 4:6; Song 5:1; Song 4:16; Song 5:13; Song 7:2
These passages feature instances where the husband is enjoying oral sex with his wife,

Song of Songs 4:6(NIV)

Until the day breaks and the shadows flee,
I will go to the mountain of myrrh and to the hill of incense.

Song of Songs 5:13  (NIV)

His cheeks are like beds of spice yielding perfume.
His lips are like lilies dripping with myrrh.

There are passages the feature the wife enjoying oral sex with her husband; here is one,
Song of Songs 2:3 (NIV)

Like an apple[a] tree among the trees of the forest  is my beloved among the young men.
I delight to sit in his shade, and his fruit is sweet to my taste.

Oral Sex is healthy for Woman. The Daily Mail published an article citing research that showed the health benefits for women.

Semen contains another of chemicals along with spermatozoa, including cortisol, which is known to increase affection, estrone, which elevates mood and oxytocin, which also elevates mood.
It also contains thyrotropin-releasing hormone (another antidepressant), melatonin (a sleep-inducing agent), and even serotonin (perhaps the best-known antidepressant neurotransmitter). Read more

Some have cautioned about the spread of the STD-Cancer through oral sex or kissing.  The risk factors seem more for men than woman. There are certainly higher those who have many sex partners. Here is an article from the Men's Journal that talked about limiting risk factors.