Resources allowing, I don't have any issue with desire demons ocassionally appearing as male, though I'll note demons are already a pretty male-centric lot and it means less work for the female VAs.
What I have an issue with the assumption is that desire demons appear female "because Bioware assumes we are all straight male gamers and want to tap that." It's basically an excuse to act offended.
Resources are scarce to come by, but I think that more variety would always be good. Technically, the only thing that defines the other demons as male are their voices. The physical appearance of the Shade, the Rage Demon, the Pride Demon, etc. are pretty ambiguous.
But to quote from original post:
"it gives me the impression"
"Which felt odd to me"
"Me (the player)"
These are all *my personal* feelings about the portrayal of Desire Demons. If I played the game and came across a Desire Demon and immediately thought 'this game was expecting me to be attracted to females' that is a legitimate perception.
I'm not pretending to be offended, or angry at Bioware for this, but as I said, it seemed rather unexpected considering I've never felt that way about any other aspect of the games.