I wouldn't say it's specifically slutty. Just silly.
How is it not slutty? They are doing it because they want one of three things:
1. Just attention because they're dumb.
2. You to look at them and feel aroused
3. You to look at them and feel aroused and then go 'warm them up'.
@ Laurel: ...you crack me up. XDDDD I just sat there giggling forever after reading your post.