Oh my goodness

So there's this girl I work with, we are both married to different people. I'm taurus, she's virgo and we are developing this kind of intimacy and there's definitely sexual tension... We have kissed before and she is always touching me. I've never gone down on a woman before but she says that she doesn't feel like teaching me and just needs sex. She's in a sexless marriage. Being the stubborn person I can be I told her I'll go get some and come back for her, she didn't want me to go. I don't know what to make of that statement since she doesn't even know how much I love to play. Is this a bad thing?