But yeah, if TOS had been cast according to today's standards of beauty, Kirk would have a ten-pack and 2% body fat, and would be shaped very differently. And anyone who looked like Spock would never have taken his shirt off or worn anything sleeveless, at least.
It's weird but it's almost shocking to me when I watch TOS and most of the men have very normal, average-looking bodies. And I mean that in a positive way, because I don't really find super-ripped underwear-model types attractive. (Should be obvious since I have been talking about my huge crush on Nimoy for several pages now, lol).
Sulu was very fit, and I like him, I'm just not attracted to him.