Hi Vivaldo, It is uncommon for one man to comment on another man as beautiful. They can use it, but it would not be common. Most guys would say another man is handsome. Women can call a man beautiful.

you can use "handsome"

Yes, but we normally would use "handsome" for men. So when you use "beautiful" for a man, someone who hears it will infer that there's something special or unusual or extraordinary about the way that man looks. Because if he were just normally good looking, you would have said "handsome."

I think that perhaps a gay man would be more likely to describe a man as beautiful.

I think we use to wen handsome .