Human Sexuality--More Discussions

So, my wife's most recent class concerned masturbation. Once upon a time, that was a word I was uncomfortable saying, but after reading some of the things she was required to read, it seems rather clinical. At any rate, the Church says it is objectively a sin. However, there are Catholic theologians who say this "sin" can be mitigated by youthfulness and immaturity. What do you think? Is there a benefit to masturbation, especially in a marriage? Is it a sin, even in a sacramental marriage? Let me know your thoughts.