Sera asks the qunari inquisitor how qunari women look like. Not how big or tiny IB's dick is and how he could be in bed.
Also lol at you thinking the "things" word could mean anything sexual at all. That's purely your own assumption.
EDIT: I wrote this before I've seen response from Lukas
That's purely my own assumption? I hoped so, and I really wanted to see something that would make it look different, I spent few hours playing male Qunari hoping that she would say the same line to him, making the whole thing just an oversight.
But it never happened, and here are the comments of people who actually defended this stuff:
JerZey CJ - Also keep in mind that a person can say that someone else is attractive even if they don't "go that way." Think of it like her saying, "Sure Bull is good looking, but I've got you and you're better."
Notshauna - I just thought she was wondering about y'know, a certain member, that's not really an attraction thing that's more a that guy is gigantic thing.
Vapaa - Merely stating someone is attractive is no big deal, and Sera doesn't spend her time swooning over IB
Steelcan - Sera doesn't flirt with Iron Bull, merely comments on his physical appearance, the dude is a tank
Corvus I - I saw that clip and thought it was cute. (I see that comment has been edited out, because it was a bit longer and genereally in tone of "even if she finds him attractive doesn't mean she wants to bed him)