If you romance Iron Bull, and you also take him and Cole out with you on missions, this little gem of a conversation happens. It's pretty revealing:
Kinky, huh? I'm not surprised that someone has banged on the war table, but damn, guys!
That's not the only instance of risque dialogue with Iron Bull. If you don't pursue his romance, and you don't pursue Dorian, they will start a fling -- and Bull is not discreet about it. It's amazing:
So sleeping with mages can be a safety hazard, eh? Heh.
And while we showed you the gay romance scene with Iron Bull, here's what happens if you romance him as a lady -- you talk about what everyone's safe words would be:
Bull's favourite colour is great:
He has good opinions about sensible armour for women:
...but he's still a dirty bastard.
These are just a few of the many conversations Iron Bull can have during Dragon Age -- but, it's enough for me to be able to say he's the best.