Who's to say whether someone is married though?
I mean I dont really believe a piece of paper is what makes a marriage...
I personally (my own opinion here) believe that a couple can be together out of love and respect and take vows to stay together whereas many who run to a Church or JP end up divorced within months or a couple of yrs.
Ive been with my husband for 17 yrs...13 married with a paper...2 1/2 without a paper and Im not about to repent for that!!
Then to add on that there are those who believe that if one isnt married infront of God then they arent married...
Where then does that leave Atheists and the like?

sorry: as I was married in a Church to an Agnostic/Atheist)...
As for the OP...Oral sex is fine as long as its between two consenting Adults just as sex is!!