Girls, how sensitive are your nipples?

Anonymous
My nipples are really sensitive (Im a B cup) but my friend who is a DD cup says hers are not so much. Thus I am wondering if bra size and/ or areola and nipple size and/ or how much they sag affects how sensitive your nipples are. Thus:
1. What is your bra size?
2. How much do they sag?
3. How large are your nipples and areola?
4. By how much do your nipples and areola change size when you are cold/ turned on?
5. With your nipples, how sensitive are they? Could you orgasm from somebody sucking on them?
Girls, how sensitive are your nipples?
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