I agree partially with the guys, there's no "rule" as such. And I suppose it depends on your definition of teasing. A fun tease would be some lip-locking and possibly some cheeky strokes and touches while out having fun. No guy is going to expect that to lead to sex, but none the less will probably get a bit turned on. On the other hand is bitchy teasing where you get the guy absolutely gagging for it (like wear a seriously short skirt all day and constantly brush against him, sit on his lap, bend over in front of him etc...), but then leave him hanging at the end of the day. Depends how you want to play it, although the second option is brilliant if you want to teach him a lesson after an argument. They hate it.