I think the Church has modified its process for accepting seminarians in the last few decades to screen for severe moral and psychological deficits such as pedophilia, sexual or even social and emotional immaturity, and even just disordered lust - homosexual and heterosexual. In other words, while normal sinfulness should not keep one from the seminary, there should be some conversion from extremes. Yes, St. Augustine did lead a licentious life, full of womanizing and other sensuality, he did first experience a profound conversion.
My guess is that an inclination to lust that is normal is not an issue, but addiction to pornography or physical sex , heterosexual or homosexual is a problem that should be resolved first. But thats only my understanding. Im not positive about actual canon or seminary regulations. Personally I think it would be a good idea. I dont think I would even pursue seminary if I didnt have a good reason to believe I would have such addictions resolved. I believe anything is possible with God, and perhaps He wants my addiction to be a lifelong struggle. Nevertheless, personally I would not want to carry that addiction into ministry unless I felt God had delivered me some spiritual tool to substantially overcome it. On the other hand perhaps it would serve as reminder of our reliance on God.
My point is that personally I would want God to show me some control over my addictions, but perhaps the Church is wiser and more trusting in the Lord to have mercy for our weaknesses and to use them for His glory. You need to talk to a priest and or a vocations director.