Here's the real explaination why guys care so much.
Girls dont understand what penis size means to guys.
If your comparing guys asking about their penis size to girls asking about their vagina or boobs you dont understand it, your comparing the way "girls" look at their vaginas or boobs with the way "guys" look at their penis. Its not the same.
I know society, advertisements, etc. are the reason girls are concerned with ,"Do I look fat?", "Does this dress make look fat?", "Why do guys like skinny model-like, or anorexic like girls over curvier girls?",(They usually don't by the way and even though there are guys who like it, its usually preferred to have some meat on the girl.), "If dont wear a lot of makeup will guys think i dont care about how i look or present myself and be offputted by me?", etc.
Those insecurities you have or if you don't have them, what girls usually have, how important those body image and beauty standards are to you and how they affect you personally, is how guys feel about penis size. It defines us as guys whether girls understand it or not. When you tell a guy his penis is small, its the same as if a girl was feeling insecure about her body at the moment and asked her man "Do i look fat?, or does this dress make me look fat?" And he said, "Yes you look fat, or no its not the dress its you that makes you look fat" and if she was hurt by it, and he was like "What is she complaining about she asked and knew the answer?".
That guy who appears clueless about why she'd react that way is the same as a girl who doesn't understand why guys worry about their penis size and would be emotionally and pychologically hurt if someone straight told them it was small. You see why they worry about it, thats exactly how it feels, and guys who dont measure up well might have the same self esteem issues that fat and ugly girls might have due to the beauty standards girls are "supposed" to live up to, according to the societies upbringing. So thats the reason why guys care about their penis size so much.
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