her nipples
you can either lose or gain sensitivity; your nipples may or may not be hard all the time; they may get a little darker, just the nipple part. and some people are really different, so it can go anyway at all, really.
yes
Your nipples are bound to hurt if forced with pressure and for that know that its totally natural due to sensitivity in the tissue no worries!"
Yes, fluctuations in hormone levels during the menstrual cycle can cause changes in nipple color and sensitivity. This can include darkening of the nipples due to increased blood flow and hormonal changes.
During puberty many boys' nipples become very sensive and indeed some boys grow small breasts, which like the tenderness and increased sensitivity, generally reduces again as you pass through puberty. And remember that if you think that your nipples are senitive it might help you to realise just how sensitive your girlfriend's nipples are.
To make your nipples hard, you need to sexually stimulate yourself. Massage your boobs, rub them, squeeze them, etc. Also, flick, lick, and touch your nipples as much as possible. Your nipples will get hard once you're horny and sexually stimulated.
Some nipples are differnt mainly because the color is varied in other parts of the skin. There is no problem with it.
Antibiotic sensitivity is an evaluation of how effective a given antibiotic is at killing the pathogen that grew in culture. When antibiotic resistance is a problem the sensitivity study helps clinicians choose the right medication.
no problem actually. the baby might feel that the man is his mum so it will just suck the man's nipples.
Male nipples have similar nerve endings to female nipples, making them sensitive to touch and stimulation. This sensitivity can vary among individuals, with some men experiencing heightened erotic feelings when their nipples are touched due to the release of oxytocin and endorphins, which are associated with pleasure and arousal.
This kind of sensitivity can be caused by the different hormones that fill the body during this time. It is perfectly normal and there is nothing to be worried about. If there is any unusual discharge with an unpleasant odour, however, this could indicate a serious problem which should be investigated through a GP.