Erm, I dont think the reason has much to do with guys having
bigger egos than girls. I think many girls have as BIG an ego as
those guys who do show off their body. Eg. girls wearing tanks,
midriff showing shirts, minis, lowcuts, seethrus etc.
Some ppl (generic) just have the mentality, if u have it flaunt it
(aka show off) while others (gals n guys) prefer not to be so SHOW
OFF.
Whats the big diff for guys to be more daring to 'reveal' i think
mainly cus guys only have to cover one spot below the belt and
thats it, the rest can show without being embarrassed or causing an
outrage.While gals, have more than that one spot below the belt, so
cannot anyhow go around and reveal above the belt as well... make
some sense? 
