Back to the topic.
If it is a sin to start the sex act, and then not finish it, every parent of babies and toddlers commits this sin several times a week! The lines for Reconciliation should be out the door!
I can’t tell you how many times over the years my husband and I were really getting into it when we heard, “Mommeee! Daddieeee! What are you doing in there?”
And once this happens, it usually puts a real damper on the sex act. Even if you want to finish, the body just won’t let you, if you know what I mean.
Serious now. I am a woman, and I am going to respectfully and tenderly suggest that your wife could be using “thyroid” problems instead of admitting that she is scared of or embarrassed by sex. In other words, it is possible that her problem is not physical, but psychological/emotional.
I would recommend that she first see her doctor, and that YOU go along with her.
If the problem is physical, then it will be taken care of, hopefully. But there could still be problems. If a woman has experienced displeasure or pain from sex, she may still feel it even after the physical reason is gone.
So ask the doctor to refer you to a good Catholic counselor who is experienced in helping couples achieve sexual satisfaction.
Don’t settle for a Christian counselor who is not a Catholic. My husband and I grew up evangelical Protestant, and the Protestant Christians believe differently about sex and teach things that Catholics believe are sins (e.g., it’s OK to have an orgasm outside of intercourse).
Pastor Jim, you can disagree all you wish, but Catholics must listen to their Church, headed up by Jesus, and not listen to you or the Bible. The Catholic Church will not disagree with the Bible, but the Catholic Church does not rely solely on the Scripture for all teaching, either. Go to other threads if you want to debate about that. Leave this thread for those who are trying to help the OP.
OP, if your doctor cannot give you a referral to such a counselor (perhaps because your doctor is not a practicing Catholic), go talk to your priest and ask him for help and if necessary, a referral. It’s possible that your priest might be able to help you, yes, even with sexual issues. If he can’t help you, I’m sure he will be able to refer you to someone who can help. He might even refer you to another older couple in your parish (and that would be good because it would not cost anything).
Everything will work out. Don’t stop loving each other and keep working hard on this. Don’t just put it aside and pretend everything’s OK. You will have to work hard, but you will be glad you did. Sex is great, a very important part of married life. Don’t settle for anything less than the best.