Nipple hardness in males can occur for several reasons, including hormonal fluctuations, arousal, or temperature changes. The body can respond to various stimuli, leading to the contraction of the muscles around the nipple, making it feel hard. Additionally, conditions like gynecomastia or certain medications may also contribute to changes in nipple sensitivity or firmness. If there are concerns about persistent changes, consulting a healthcare professional is advisable.
yes, if this has happened you should also watch for infection
I would press charges. That is abuse.
Stimulate it.
No
puberty
The same as if you flicked a straight guy's nipple. If it's sensitive they jump, if they don't like it, they deck you. Whatever.
yes they will be hard
Your eather horny or cold!
You get cold, or stimulate them mentally or physically.
Guys LOVE Hard Nipples. It Is Easier For Them To Suck On And Wrap Their Tongues Around!
Mine seem too!
About as harmful as getting a hard nipple.