If you want to know Jesus' opinion on the matter, you might want to look at Matthew chapter 15:
18 However, whatever comes out of the mouth comes from the heart, and those things defile a man. 19 For example, out of the heart come wicked reasonings: murders, adulteries, sexual immorality, thefts, false testimonies, blasphemies."
So what comes out of the mouth is speech, what a person likes to talk about. Also in his list is wicked reasonings. What reasonings are wicked are thinking about wicked things that people do, such as thefts, sexual immorality (which is any kind of sexual relations outside of the marital union, which includes fornication and homosexuality as well as adultery), and other things.
This word is brand new to me, so I looked it up in Wikipedia - "Outside of Japan, hentai is anime and manga pornography. In the Japanese language, however, "hentai" is not a genre of media but any type of perverse or bizarre sexual desire or act."
According to Jesus' words, what a person dwells upon and constantly thinks about in his mind can defile him just as surely as the act.
An antidote to this poisonous mind defilement can be found in Philippians 4:8-9:
8 Finally, brothers, whatever things are true, whatever things are of serious concern, whatever things are righteous, whatever things are chaste,* whatever things are lovable, whatever things are well-spoken-of, whatever things are virtuous, and whatever things are praiseworthy, continue considering these things. 9 The things that you learned as well as accepted and heard and saw in connection with me, practice these, and the God of peace will be with you.
So if you want real peace from this occupation, the kind of peace that only God can give, make a habit of replacing the thinking that you described with considering the things that are in this list, and pray to God through Jesus for help to make such thinking a new habit.