Male firefighters (which can be easily found using the search term "firefighters"; specifying gender is not important) are epic badasses who spend their days running into raging infernos with as much stoic calm as a cool guy walking away from ... an explosion ... that started a fi- holy shit.
Of course, there are pictures of the stereotypical male firefighters beefcaked out. But in the first 10 pages (there are well over 100) of stock photos, only five can be found. That's one sexy fireman photo for every two pages. There are actually more photos of children pretending to be firemen in the first 10 pages than there are images of hot firemen -- correction, sexy firemen, because obviously they're all pretty hot. Because fire.
On the other hand, firewomen (you can use the word "female" in the search if you want easier results) look like they spend 90 percent of their day spinning around the firehouse pole.
There are only 12 pages of female firefighters, and the majority of the images aren't even women. Also in the mix are kids, men, and a bunch of cartoons that would only be sexy to castaways trapped on desert islands with nothing but coconut mannequins to satisfy them.
The same themes occur across the board -- including the gender-specific search term requirements) whether it be male vs. female police officers ...