Many women are very concerned about their appearance. Although it might be totally acceptable for a man to run a comb through his wet hair for all of 15 seconds, a woman at an office would be expected to have niced quaffed hair(mousse, hairspray, blown dry, curled,etc...) She may also have to wear makeup and pantyhose.
Many men on these boards talk about a wet nap "shower" as being acceptable. But most women have higher standards for hygiene and appearance than most men. It is too much trouble and takes too long to do all of that in a public restroom after a bike ride.
I have naturally curly hair(long) and once I sweat on it or put it in a pony tail for a ride...it looks atrocious. The only fix is to shower again, condition it, put anti-frizz serum, let it air dry for 20 minutes, then scrunch, let dry again for five minutes, scrunch again, then let fully dry. In the mean time I look like a drowned rat. No thanks. Now if I had a simple short haircut like a man, it would be a totally different story.