I think rapport plays a big role in this. How much time have you spent with that girl pre-'sexting'? If I did that with the HB8 she'd probably be creeped, then again if it doesn't work I guess you could cover with "oh shit you're not my/your mom/sister/boyfriend... er... what up with you?"
"Do not be too timid and squeamish about your actions. All life is an experiment. The more experiments you make the better."
- Ralph Waldo Emerson
"Holding your breath until you pass out underwater is the ultimate demonstration of mental fortitude"
- Spec Ops Training