AITA for having sex with my boss for a promotion? ... The nerve on the comments

Title says it all really. Neither of us are in a relationship. I was discussing my pay with my boss and hinted at "other" ways to get a raise, he picked up on what I was saying and I slept with him. He's mildly attractive too so not only did I get to sleep with him, I also got a promotion out of it.

I told a friend this and she said it was unfair to other employees and that I was using my body to my advantage. And... She isn't wrong. Fucked my way up to the top, now we're here. AITA?