Is it permissible for a Muslim man to look at a another man whose satr is not covered?

Answer:

(Fatwa: 1628/1396=B/1429)

No, it is impermissible and haram. It is allowed for spouses and for doctors only as much as needed.

Allah (Subhana Wa Ta’ala) knows Best

Darul Ifta,
Darul Uloom Deoband