You can't argue that 40k panders to the LGBT crowd because fuckin obviously if you've ever even looked at a 40k title, but you also can't really argue that 40k isn't at least a little sexual.

You got ratlings, pretty much everything slaanesh, aeldari waifus, and the entire Ciaphas Cain series. And while yeah, you don't exactly get steamy love triangles in mainline 40k lore, you also have callidus assassin's and sisters of silence popping up all the damn time. Sex isn't the focus (mostly. Looking at you ciaphas) but it's certainly present in the setting.