I went shirtless when the weather did not permit a shirt. --- tk
Well, well. Trying to invade this male discussion...
With a fair skin like mine (or my husband's, for that matter) you'd be peeling the skin off your shoulders after about 15 minutes. It's never a question of necessity, it's a question of taste. Personally, with about 90% of the shirtless men I see, I'd rather they kept their shirts on, to be honest

(looking to nobody in particuar for their facebook pics, hrhrhr).

I have to admit that there are exceptions, though.