For a guy, boxers supposedly ventilate that region better than briefs, letting everything hang loose. Presumably for a woman (provided the body fat composition is about right) no bra support is needed? is it good for the human body to hold our bits up (male or female) in such unnatural ways??
I might edit the way I am asking this.
I prefer my "bits" to remain in as youthful of a state as possible, therefore support is utilized. Every little bit of insurance against gravity helps. Will it make a difference in the long run? I don't know but I am not about to change that habit. And there is no way I am going to work out as hard as I do without as much support as possible, that is not conducive to a good workout. If not wearing a bra is considered "natural", then in this instance my vote goes for the modern status quo.
Boxers > briefs. The scrotum has built in temperature control that works poorly in briefs and inhibits your testosterone factories.
I need a bra. No matter where I get the rest of my body fat composition-wise, I will always need a bra. After having mono for 3 months years ago I got down to 105lbs, but still had DD's. Some women will always need a bra. I also believe it serves the woman better later in life if she wears a bra earlier in life. But this is all from a purely 'way you look' perspective.
While I am working out it is painful not to have a bra -but I whip that contraption off as soon as I get home!
As for underpants/panties I dont think that they are necessary if you are wearing the right clothing (fibre-wise). Commando sure does feel free!
I have no scientific reason for it, but I have always preferred no underwear.
A bra is absolutely necessary for me if I want my boobs to be where they look the best to me.
Have you seen older women in no-clothes tribes? well, I don't want to have my breast hanging till navel any time soon. It is painful to do any physical exercise without a proper protection. Good bra also helps the back and shoulders. I do take it off the moment I get back home, though.
In terms of underwear for women - we have pubic hair for a reason. It's for protection, same as the fat over pubic bone. No underwear (with pubic hair intact) make sense only with loose skirt kind of clothing, not tight, possibly irritating pinching pants. I don't even want to think about the health risks and discomfort of wearing no underwear (and I mean real, not a tiny little string), shaved pubes and tight pants.
in terms of male, there seems to be the same principle - protect from possible injuries, but without too much coverage that could rise the temperature.
Wearing trousers without underwear is gross. How would you like to go into a shop and try on and or buy trousers that someone else had tried on over their bare bottom and smelly fanny. Yuk. Gross. If going shopping for trousers please please please wear clean cotton panties. As for the rest of the time it's easier to wash a pair of panties every night than it is to wash yr trousers every night. And panties are cheaper than trousers to be buying all the time.
There is no scientific evidence that bras protect from sagging later in life. Not having 5 children definitely does though. Not wearing one has helped some of my back problems. When I do wear a bra I wear a lightweight bralet and not one of the underwire megabras I used to wear. Some women need them, most don't.
I haven't worn underwear in more than 15 years, probably. I'm 29. It always just seemed like a useless extra step, and a waste of space in drawers and laundry baskets.
Two caveats: I do wear boxer briefs at the gym, to keep "everything" from swangin' all over the place, if you catch my drift. Pants tend to wear out faster in the crotchular region. Must be something about "THAT kind of sweat" or something. Or maybe I just wear the same pair of jeans for a month straight without washing? Who knows.
I feel great. HIGH sex-drive (my girlfriend says I'm insatiable). I just never felt right in underwear, it chafes, smells, makes me sweaty, wastes my money, makes me feel all..."shoved in."
Hope that's helpful!