I don’t think cross-faction fun would be quite the right word! You see Alt doesn’t really like anything. He’s a sour hippo when it comes to dealing with people, it took years and years of canon timeline for him to build up the nuts to actually consider developing anything intimate with Byriel – A good chunk of their relationship was fundamentally both of them fending for their lives in Outlands.
He had a Draenei stripper dance on his lap once at a bar, he wasn’t happy at all about that, I doubt he would appreciate anything sexual with a stranger.
TLDR; One would only try to hit on Alt if they had a death wish. The first warning would be a black eye and the second, probably being impaled on his rune blade.
Man that would be uncomfortable, what with the hooves and all