Bra issue maybe: even though she denies sexual activity, check a pregnancy test. Nipple erection is relatively common in young women. A sore nipple often times is a sign of a poorly fitted bra as well. Take her to a good lingerie shop and have a bra specialist confirm she is wearing the right size. Young women who are active have this problem commonly. The rubbing exacerbates the nipple erection too.
Answered 8/30/2015
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