Winky faces always make things more "adult", I would say. I mean. Compare:
Jim: Hey :)
Jim: Hey ;)
The first says, "I am happy to be greeting you."
The second says, "How's it going hot stuff?"
So, yeah. Emoticon winks. Always a little risque in my head. IRL** winks are totally good. They are cute and silly and also kind of challenging...haha, but anyway, yeah.
*Artwork found on internet.
**In Real Life