Poison Ivy have tried to kiss Robin many times. When she finally kiss him, she should have kiss him longer and more passionately like she kiss Woodrue and Freeze's bodyguards. Just so that Robin gets to fully taste Poison Ivy's luscious lips and to make sure he gets the full dose of her venom. Also, after robin revealed that he is wearing a rubber lips, poison ivy should have try to kiss him again. After all she have tried to kiss him many times

Definitely Woodrue! She actively takes her time, and even moans passionately as she relishes her first kill!

The first guard in Arkham. I noticed how he wrapped his arm around her as their lips met.