You would be surprised at some of the BS you can get away with though.
A few years ago, we got a new 24 year old ETL-HR. (about my age at the time) I had a feeling she was interested in me. (I was a GSTL at the time)
She was always calling me in the office and just talking about her personal life with me for 30 minutes at a time, always making casual cryptic insinuations that she thought I was attractive, etc.
One night we had just closed the store and let the team out. We were the only two people in the building. We were in her office going over the schedule and she was flirting with me casually. We were talking about how bad all of her past relationships were, and how she wished she had experienced more in life.
So anyway, she got up to walk out of the office and as she got up she said "It's too bad people can't do the things they want in life". I grabbed her crotch and said "Like that?"
Looking back on it, I don't know WTF I was thinking because that could have gone so incredibly wrong, but at the time I just had the feeling that was what she wanted.
Lol, long story short she ended up closing the door and we had sex in her office for 45 mins.
We ended up getting together outside of work all the time for a few months after that. Eventually she moved out of state and we lost touch.
No one ever found out any of it was going on.