Honestly I don't care as long as it's not physically in my way somehow. I spend most of my time around couples so people making out doesn't bother me like it used to, so unless it's in a public place and the couple in question is holding up pedestrian traffic... doesn't matter to me.
NOTE: This does actually happen to me fairly often; I'll be walking around my school, and there in the middle of a busy staircase... some couple decides to have an extremely long hug or make out right in front of everyone. That's when it's a problem.
NOTE: This does actually happen to me fairly often; I'll be walking around my school, and there in the middle of a busy staircase... some couple decides to have an extremely long hug or make out right in front of everyone. That's when it's a problem.