I was born and raised Catholic and am married in the Catholic Church. This post touches on a few issues but they are interrelated and have troubled me for many years. I am aware of what the Church teaches is sexually permissible and what is not in a Catholic marriage. I am aware for instance that oral sex/mutual masturbation is considered a mortal sin. This teaching is not something that is forbidden in the 10 commandments or mentioned in Jesus’ teachings but is created and enforced by the Catholic Church under threat of eternal damnation should the person die prior to repentance. If all man are judged under the same law, this would necessarily mean that nearly all people go to hell, as most who do not abide by this law do not repent since they either do not believe or agree with this teaching, including most Christians and even many Catholics. I cannot believe that hell is what God has in store for nearly all of humanity, and if He does judge all on this standard, how can one consider God to be the loving and forgiving God we are all taught? If He does not judge all people on this standard, than it would seem that Catholics are judge far more harshly and stricter than those who do not believe. And if this is the case, why would anyone want to be Catholic when it just means your judgment will be that much more strict and your punishments far worse than the non-Catholic?
From this I see that you actually do not know what the Church teaches about sexuality within marriage. And calling it “mutual masturbation” is oxymoronic because masturbation implies one doing something to one’s self. So, if both spouses were masturbating themselves instead of each other, that might more qualify to be called “mutual masturbation”.
The Church teaches that oral sex and mutual stimulation are okay as long as they are not used in place of actual intercourse. So, doing both as a means of foreplay is acceptable as long as the man “finishes” inside the woman. So, it is usually discouraged for the man to receive oral sex because of the chance of ejaculating outside of the woman.
The Church’s teaching on sexuality has to do with keeping the body as a Temple of the Holy Spirit, which is talked about in Scripture, and using the Temple as it is meant to be used. Remember how Jesus tossed the tables and tossed out the money traders and tax collectors from the Temple?
Your view on the salvation of people and how it works is a little off seemingly misunderstood. When we sin, we are choosing ourselves over God, like someone choosing to rob someone’s house over working hard at getting a meaningful and legal job. It is our choices that send us to hell, just as a court judge sends people to prison, in reality, the people sent themselves to prison by their choice to disobey the law. The same goes for God. God gives us what we want because he loves us. So, if we are choosing against God, then God gives us eternal life without him. It is our choice. We are to conform to God. These rules and laws aren’t meant to be an impediment on living life, they are meant so that we may have life and have it more abundantly. Just like how we are allowed to eat junk food as much as we want if we so desire, but our actual quality of life won’t be as good as if we ate healthy foods instead, even if we don’t see healthy foods as desirable.
The Catholic Church doesn’t judge the state of any individual’s soul as to whether they are hell-bound or not, because God is the eternal judge. But we can give brotherly correction and fear for the state of your soul.
I pray that you read the Catechism of the Catholic Church, stick around this forum, and do some reading to see what the Catholic Church actually teaches. It isn’t about judging others, it is about trying to free ourselves of sin and conform to God’s will, because God knows what is best for us much better than any of us do.