Is a young man who is about to get married sinful for being aroused and having pre-seminal fluid (wady) or semen (many) discharged while reading and researching matters of marriage and how the marital relationship takes place?

It is not permissible to extract semen by any means other than sexual intercourse, due to the harm it causes. However, if a person thinks and semen is discharged unintentionally without deliberately invoking the thought, there is no sin upon him, but he must perform ghusl. But if he deliberately invokes the thought to discharge semen, it is not permissible, and he must perform ghusl. This contradicts the character and chivalry of a Muslim. A Muslim must distance himself from such thoughts and occupy himself with what benefits him in his religion and his worldly life.