Y is it so differ btw guys n gals?

My frenz put a shout out that she say y tat's so unfair, guys can do the things bt gals cant?
Yes, y r us are both human yet there are so many different between guys and girls?? Girls have to go through the period time, pain especially when the time of give birth. But guys never noe the pain..

When guys silence and show their seem like close ppl had die, they will say it is COOL while when gal did, they always say that she is arrogant.

When guys are a bit rude, it seem like reasonable, but how was it when gals did?

Y is it seem like "geng" when that guy mingle with a gang of gals? While gal? d word cheap is used! Mayb will be added some more description, "姣"!!

N wat's the description when guy has muscle is differ with gal who has muscle?
why why n why??