I have in the past

I've actually played with a few.

I work with a very attractive woman that is about 20 yrs younger than me. The sexual tension between us has always been very high. She has even kissed me one time and is always standing close to me and touching my ass on occasion. I'm not married but she is, so I've never pursued getting together with her. If she were single, I would definitely full fill that fantasy.

That last one is fitting for me...

In a past job, not in my current situation.

I've actually had sex with a co-worker! But yeah, there were many fantasies beforehand.