Interestingly, before I read this post and the comments, I have always thought that :-) means a smiling face. Ie, to convey a sense of a smile after writing a message. Not a "I am joking" message.
Well, I learned something today.
Well, I learned something today.
Definitely in modern emoji sets the tongue out emojis seem to be better indicators of an intended sense of humor more than flirty/suggestive ones (plus the combo ;P for intending flirty and funny).