Kerryn grabbing Colin's junk.
I say this not because it's dear Colin, but because, well, look at this situation. Colin is a 21-year-old virgin and uncomfortable with girls. Fine. I don't see what exactly makes being a 21-year-old virgin soooo very terrible (it was kind of insulting when Sandhurst compared Colin's life to The 40-Year-Old Virgin), but whatever. So, Kerryn's playing around with Colin, and he's incredibly visibly uncomfortable. Kerryn's response to his lack of comfort with her physically (she even recognizes that she "scares the hell out of" him) is to grab his crotch.
Uhhh. Well, imagine if the genders were reversed. Imagine if, I dunno, Jordan was a virgin and uncomfortable around guys and Gabe decided he'd make her into his own "pet project" and was constantly grabbing at her, trying to kiss her neck, etc. It wouldn't be cute. If Kerryn said her constant borderline-sexual-harassment of Colin was to psych out the competition, that'd be EVIL, but it'd make more sense than "oh I'm just trying to make him comfortable around girls!"
Oh man, is Colin ever pretty, though.
As for Make Me a Supermodel (and America's Next Top Model, of course), more on that later.
