Is it ok for a Christian couple to have oral sex?

We will carry on educating ourselves and eachother in everything that the Bible teaches and in everything about life!
Sexuality is one of the main reasons why so many are ending in hell and have their life destroyed, so i dont understand why many avoid and are shy to talk about it!
But here, on my page, i am not shy and will talk about it!
Lets see what exactly the Bible says!
Bible reference
Proverbs
5:18

May your fountain be blessed, and may you rejoice in the wife of your youth.