Luke likes pretty things. He likes wearing pretty things that make him feel pretty. Panties, skirts, flower crowns, lingerie, basically things that are stereotyped towards girls. He's in college, studying to be a psychologist.
Michael likes pretty people. He really likes Luke. Most of the guys ignore Luke and Michael usually does too. But he can't help but notice how good Luke's ass looks in the tight black skirt, or how pretty the lilac flower crown looks sitting on top of Lukes blonde hair.