I mean... well... I've seen guys holding hands, looking at each other, kissing... touching.... etc.........
and it is hot.
fans self
It's just human nature and something that can't be controlled.
Why are [anime/manga] guys so hot.
ugh.
It's a blessing and a curse.
But I don't read much BL actually because the plot/art styles don't really interest me. This might be getting at what @gempompadour was saying about their friend who likes "slash" more than BL. I think slash would mainly refer to when you ship characters together who aren't necessarily together. I love to slash characters together more than I like most BL! Maybe because there's a deeper relationship between the characters that goes beyond just a romantic attraction? Like they're friends first and get along well.
Or there's UST (unresolved sexual tension) between them? That's nice too.