NSFW. If a man has intercourse with another man but claims to be straight, do you believe him?"?

These men identify as straight but they enjoy having sexual relationship with men for sexual release or fetish reasons. They have sexual fantasies about men, but they are not attracted to them as a person. Does this make sense to you?

There are also other types of straight men who like the pleasure of being anally penetrated but they identify as straight. What do you think?