He's been watching a lot of gay porn

Recently my fiance's email was hooked up on one of my devices. I didn't realize it until I went to Google to search something. Under recently searched items it said something about gay porn vids. I guess the gmail is synced to the searches made? So I confronted him about him and all he said was I'm not gay. I know he's watching it often. I mean it's not the only kind of porn he watches. Would you bring it up again? I'm not mad or anything, I think i just really want to understand what about it gives him pleasure to watch or is it deeper than that? Anyone ever experience this?

I personally do not prefer gay/lesbian porn, I suppose that's why I'm so intrigued by his "need"/"want" for this kind of porn.