Do straight men checkout other men?,Just like women do?

My boyfriend admitted checking out men and in his mind complementing their body or face even mentioned having "thoughts" but says he is completely straight.so, do straight men checkout other men?
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We've been together 5 yrs. I asked him if he was gay 2 yrs. Ago he said NO! Why would you think that? He doesn't communicate well at all but he's an amazing sweet guy very respectful my family loves him but recently he's had anxiety attacks which have now led us to doctors & he finally admitted his brother molested him.he had to give him blow jobs but said he's never been penetrated by a man,he went through a little phase of checking men out and thinking wow he's hot & having thoughts.so what think?
Do straight men checkout other men?,Just like women do?
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