Agree with Bob. Many many years ago I had a co-worker ask me pretty much the same thing. We never went all the way but HJ, BBJ, and DATY. I was loving it, zero cost right, just a fun time between 2 adults. But then, the issue happened.
Turned out her marriage was on the rocks. Told me I should leave my wife and go off with her. Except I didn't like her THAT much. Enough to fuck around with, but wasn't prepared to blow up my life for her despite she was a lil on the freaky side which of course I really liked.
Without boring you with 1000 paragraph long story short is I told her I can't and she made threats about going to talk to her directly. This is when I realized if u want to keep your SO/Wife, you are way better off hobbying than finding side action, even if its free. Unless u got a way of doing that and maintaining anonymity I think it is very risky. Almost bit me in the ass, so think long and hard before you engage.
Good luck.