I personally am not touch-oriented when it comes to other people beyond a handshake, but public displays of affection really do not bother me so long as it is tame (i.e. hand-holding, cuddling at the park). Hell I don't even mind if a couple is making out on the bus; to each their own provided they maintain a distance from me of two and half meters. If I'm in a relationship, the only person I should have to prove my affection to is the woman I am with, not the random passerby or concentration of people in our general vicinity. If I commit any public display of affection it will be to get that point across to her, not the world.