How do we respond to those who say that Yusuf (peace be upon him) is not an example in avoiding adultery, claiming that prophets are infallible from grave sins, and that adultery is one of them, and if they fall into minor sins, then we are even more prone to do so?

If the intent of this statement is to trivialize the significance of sins, then this is rejected both religiously and rationally. Allah made the prophets role models for humanity, as He says: "There has certainly been for you in the Messenger of Allah an excellent pattern." The prophets are humans like us so that emulation of them can be achieved; they are not angels, because angels do not disobey Allah and do not possess desires. Therefore, the Messenger must be human so that he can be a role model in the practical application of divine teachings.

Regarding Yusuf (peace be upon him), the "inclination" mentioned was a fleeting thought, not a determined intention. It was a natural, instinctive urge that Yusuf repelled through his piety towards Allah, which was a good deed for him. The example to be followed in this is that Yusuf (peace be upon him) found within himself what humans find in terms of instinct, but he repelled it and abandoned it for Allah's sake.

The difference between prophets and righteous people is clear, and it does not negate the concept of role modeling. Prophets are infallible from sins, whereas others are not. If a believer commits a lewd act or wrongs himself, he remembers Allah and seeks forgiveness. If a suggestion from Satan touches him, he remembers and becomes aware. Sins are an inevitable matter for the believer, but what is important is not to persist in them and to repent from them.