If the mechanic was a woman, she might. Civvie women often trade sex for favors, they just don't advertise it. I had a friend of mine who rented a spare room in his house. When he rented it to a hottie, within 4 months she was fucking him in lieu of paying the rent. I had someone else tell that a RE agent fucked them to help close a sale. The MeToo# movement aside, women routinely fuck their bosses. In the military, apparently there is a LOT of fucking. Some average (6 or below) looking girls go in and, for the first time in their lives, they are in remote, isolated locations surrounded by men who pay them a lot of attention. And they responds accordingly, sometimes in very outrageous ways. I've heard enough stories from vets that its hard to dismiss it as simply BS.
My own personal rule is NEVER to fuck someone in my professional orbit, either at my company or a client. I do get the occasional nibble, but always pass. No good can come of it. I've seen it happen and, before too long, EVERYONE knows and it always ends badly. It's just not worth it.
I love women, but one reason why they're often a step below men professionally is that they often rely on sex or sex appeal to get what they want. I'm convinced that it's so intrinsic to their nature that many may not even realize it when they're doing it.