I'm thinking of having an intimate encounter with a colleague, who is married and I keep coming in and out of guilt
Does the woman feel bad about it?
No, she said she has no regrets.
I do not think that that is okay! Just because she says she is fine with it, you got think about how you would feel if you were her husband.
Why? I'm just having fun.
It's wrong to encourage a person to cheat on their spouse. Also, this can cause you problems at work when the women's husband finds out.