Please do a search in the Moral Theology Forum. You will find that this has been debated to death over there. There is no need to start a new thread for this or any other marital relations question.
Christopher West’s book is a great place to start if you have questions on marital sexuality.
This would be acceptable as foreplay, but all acts betwenn husband and wife must culminate in intercourse. By itself, in place of intercourse, it is a contraceptive and masterbatory act-- and gravely immoral.
Especially for the male partner, if oral sex is done to completion, the man becomes guilty of wasting his seed.
As foreplay, maybe. But as the total sex-act, it is no more than mutual masturbation.
I didn’t want to go into technical details, but ejaculation in the mouth just doesn’t go. There’s still the human dignity aspect, but I guess some people would not feel demeaned.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.