How do I find out if the guy I like is gay without asking him?

Should I for example ask him about his opinions on famous men and women, for example do you think her or his body is nice?
He hasn't clearly said if he is gay or not but all of his friends say he is. And I am a girl.
Update: This is a serious question. I know there is a lot of other guys but so far when nothing is really clear, I still wanna try. He is everything I am looking for
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