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The sensitivity of nipples is related to hormones, girls during her period are more likely to have sensitive nipples. Aroused girls also get more sensitive.
A good way to tell how aroused a girl is during sex or foreplay is to play with her tits, the less stimulation you have to apply the more excited she is.
If you a girl starts to play with her tits during sex is very possible that she isn't feeling much and is trying to get aroused.
