Our expert says:
Discard any idea of "confronting" this has become a fashionable idea but rarely ever helps at all. Only he. maybe, can tell you what this means. And you have the problem, I suspect, that you could be accused of snooping when you discovered this, so he could try to switch any discussion to one about privacy and snooping, rather than the significance of this in terms of his sexual interests.
Remember, most people are not 100 % straight or 100 % gay, but somewhere on the spectrum between these two extremes, so its not unusual for primarily heterosexual men to have some interest in gay sex. Or it may be that he's rather more interested in gay sex, either as a mental idea, or even in practice. Don't panic, and don't be aggressive ( or he'll clam up and you'll learn much less. Tell him you found this in some accidental way, and are curious about what it might mean, and leave him room to explain.
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