I don’t think it’s fair to say all straight guys are secretly bi. In my experience I’ve found that guys who identify as straight who I’ve played with haven’t always been looking for the closeness. It’s more about the physical act of sex than anything affectionate like kissing or cuddling. Again, this has been true of most but not all. I’ve been watched and touched by women whilst playing with guys but I’d still categorise myself as gay when someone asks. I think we’re maybe in a time where the old boxes don’t fit and so long as there are two consenting adults (or more if you’re lucky!) then what does it matter if you enjoy it.