You females, you think everything means something. You need to realize guys are a lot more simple than you imagine. Kissing your neck, easily explained. It has been widely published that girls get horny as a response to having their neck kissed. The guy was trying to make you horny so he could have sex with you. That by the way is also the reason for basically any interaction guys have with girls beyond asking what time it is. Sex is what we want from you. Other than sex, we can pretty much take care of ourselves. There just isn't much else we need from you. If you can get that idea firmly in your head, you will be in a much better position to understand male behaviors and the future.
i don't know about the forehead part lol, but from my experience girls tend to be very sensitive in their neck area, so anytime a guy begins to gently kiss a girls neck means that they are trying to get into their pants..jk well its just a method that guys use to get a girl in the mood..