When I was younger, I thought it taboo and didn't really find any interest in checking out other dudes but as I have gotten older, the sight of any 'fit' person is a pleasure for the eyes. To know the work involved, nutrition wise, workout and dicipline makes me apprectiative of that person. I do not look intentionally at other naked guys, but glancing at the abs or traps is nice, not it a sexual manner but just nice looking at girls and guys who are fit.