Genetics,,, I once had A girlfriend that had nipples that were undetectable without your eyes.
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Uhhh, that you're cold...
it depends on how big the person is if your smaller you are more tickley if you bigger you dont feel a thing
All humans, both male and female, have nipples. The only way a person will not have nipples is if they have been surgically removed. If someone should be born without nipples (either male or female) this is an abormality. Related link: http://en.wikipedia.org/wiki/Nipples
under his nipples
Nope. Playing with your nipples feels amazing. Lots of girls play with their nipples because it makes them feel good.