› firstname.lastname@example.org 
I am a 39-year-old straight woman having the time of my life with sex. I have two questions for you.
First, my current somewhat exclusive (28-year-old hottie irrelevant, I'm just braggin') sex partner and I both know that nothing that touches the anus should then touch the vagina without washing first. However, sometimes in the course of, well, intercourse, it accidentally happens, whether an accidental brush with the anus during vaginal intercourse from the back, or an accidental penetration of the vagina during anal intercourse. Is there anything that can be done to prevent weird vaginal consequences when this happens? Douche? If so what kind would be best?
Other question: My current SESP has a rather large penis (braggin' again) with a downward bend. This makes vaginal intercourse doggy style AMAZING, but every other position from the front that we've tried pretty painful. Any suggestions for positions we may not have thought of that would benefit from this kink in the dink?
Excellent bragging! And who could blame you?
The anus/vagina question is eternal and vexing and probably (thankfully) somewhat blown out of proportion. There is of course a subset of women (heavily correlated with that subset of women who e-mail columnists who offend them, as it happens) who have vaginas like the princess and the pea, except the pea is anything and everything that could possibly cause a vaginal infection, and the princess is a vagina. So, pace the prolifically e-mailing vaginas, who shouldn't be taking my advice on this, many or really most vaginas simply aren't that delicate. You should try to avoid cross-contamination, of course you should, but as long as you stick with the front-to-back wipe and other basic common-sensical hygienic measures, honestly, you'll be fine. Has anything bad happened yet? How long have you been back-to-fronting with this wow-that's-young-but-hey-good-for-you hot guy, anyway?
The accidental brushing-up against I imagine must happen in so many acts of intercourse that if it were a likely route to infection we'd all be ... well, ew. There's no funny, clever way to describe the state of suffering from bacterial vaginosis. Let's just not be.
Your other accidental exposure, the "it just slipped in" part, though: really? This I don't think I've ever even heard before, that he'd be going about his anal business and accidentally perform vaginal intromission now and then. That doesn't sound like such a great idea (although, again, have you had any problems?) but I think it could be avoided. Ask him to pay attention! Maybe he could use a hand as a sort of vestibule-guard (a doorman, if you will), or you could use yours. Maybe one of you could adjust an angle to make it less likely. Maybe you could, I dunno, insert a small device to block the entrance, which could be fun anyway?
My best advice after "don't do that," though, is just to keep everything clean. Wash before (not douche, just wash). Wash after. Pee a lot. Cleanliness is next to, well, possibly not godliness in this case, but certainly UTIlessness. If you don't believe me, you can ask a porn star. I was looking around for one to quote on this and found one I happen to know personally (although not that personally), being interviewed at my very own home paper. It's Lorelei Lee, in the Bay Guardian's sex blog www.sfbg.com/blogs/sexsf/2009/02/ask_a_porn_star : "Shower immediately after every shoot," Lorelei says. "We are probably some of the cleanest people you know. That said, sometimes we do get UTIs or yeast infections or BV, in which case we go to the doctor like everyone else. Not too sexy, but not the end of the world either."
So there you have it. Take a shower. Take two.
Now, about your bendy guy. That's really funny, since people who talk about women's sexual anatomy and response (that would be me) are forever pointing out that you can have things stuck up there all your life and never have an orgasm from it because that spot, you know the one, just doesn't get enough attention unless the penetrative device has a bend in it. Fingers (crooked) work. Purpose-made toys work. That thing most obviously intended for penetrative purposes, though, that just doesn't work. Except when it does! You're having the time of your life? Isn't that good enough? I'm sorry, but there really is no other fix. Your fella's may bend, but it doesn't want to bend back. You don't want to be responsible for what could happen if you try to bend it back. So I think you're going to have to count your blessings and stick with what works. At least, in your case, it works very well indeed, and that is so much better than it works for so many other couples that all I can say is keep that guy; you'd miss him.
Check out Andrea's new column "Now What?" in the cool new sex zine Carnal Nation (carnalnation.com). Catch Andrea's workshop "Is There Sex After Baby?" at Recess Urban Recreation (recessurbanrecreation.com ) March 30. Andif you have wondered about San Francisco Sex Information's famous sex educator trainings but never did anything about it, here's your chance. Classes start soon. Info and registration at sfsi.org.