When I make off-color jokes/comments toward girls (not even necessarily sexual in nature) they either get creeped out or they just think I'm funny but aren't interested in or attracted to me. If I don't they just see me as Mr. Boring Nice Guy. How do you find the right balance?

Here's an example: I was employee of the month awhile back. I wanted to keep my EotM photo but it's gone. There are two women in the breakroom so I jokingly said, "I'm not accusing anyone of anything but which of you ladies stole my employee of the month pic for your secret stash?" One laughed, the other got all up in arms. I don't think I said anything wrong. It's not like I said, "Which of you skanks is finger-blasting yourself to my pic?!" but by the way she responded you'd think I did.