Dear Matsume,
I slept with my room mate last night. It was great... and I can't stop thinking about how great it was.
But he is my room mate and one of "the guys." There is a large group of us who met here in Shanghai, and I'm the only girl who stayed more than three weeks. After six months of being the chick in the group, the proverbial "girl next door," I slept with one of them.
And I can't stop thinking about how much I would like to do it again.... and again.... and again.
We're adults right? People have sex. So why do I feel so guilty? But at the same time I'm fucking glowing! Like I have this huge dirty and spectacular secret that I can't share with my boys, and that is fan-fucking-tastic!
Desire is natural, but please tell me that I need to get over myself and quit fantasizing about my room mate because he is -- in all fairness -- an untouchable entity by cardinal rule or something...

Dear T,
Right on sista!!! Great sex is great sex! Especially if it's a little on the no-no side! But if what you say is true -- that you guys are adults -- and if you both can be mature about this, then why not!
But I can't stress too much on both of you being grown up about it. Meaning, you guys are both very clear about this: the sex is great, no strings attached, you're just fuck friends and if feelings do start to come up, you'll talk about it. And when you or he talks to you about any changes in feelings, you'll 100% understand that it started as just a great fuck.
The rules have to be very, very clear! No mind games, no jealous weeps, just great fucking sex!
Plus, I'm sure he's spankin' his monkey too just thinking about what happened between you guys. But remember a lot of men can't be adults about this or have a hard time believing that us women can be adults too. I don't blame some of them. There are some fucked up crazy women out there who can't handle their fuck friends sleeping with someone else. Duh.
Enjoy the sex, if it was good. And if it was a one time only thing for him, trust me there's a lot of guys out there looking for a no strings attached night!
Craigslist!