When certain girls touch me a strange feeling happens?

Anonymous
OK here is the deal. When certain girls touch me like the brush of their hair or the hand on my shoulder I get this tingling feeling and it feels good. But when other girls touch me I get no feeling at all. I have had an older women touch my shoulder and I got the feeling and I have had girls around my age (23) touch my arm and I got the feeling. And not to long ago a girls hair touched me and same feeling but when I look to see who it was a 12 year old looking girl and that made me sick because it was so wrong. But it got me thing this feeling is not effected by age but something else. My question is what is this feeling and what makes this feeling happen?
When certain girls touch me a strange feeling happens?
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