Whoa! Dial it back a notch, sister. You want to go from drunk emailing him a racy photo to "let's grab a cup of coffee and get to know each other"? It's safe to say you've moved past the whole casual hangout thing. If you get together, he's going to be expecting more than just a casual thing.
Are you looking to date him, or just sleep with him? Sounds like you want to ask him out on a date. I'd take a step back The "oops" thing isn't going to cut it. Drunk or not, no one "accidentally" attaches and sends a photo of themselves in their underwear. He's going to assume you sent that to him on purpose. So make it clear that you'd like to hang out and get to know each other.
Remember, he's already seen you in your underwear. Let's level the playing field a bit, shall we? You need a little more control here. Pull back, and make it clear you want to go on a normal date. He knows you like him. We've already leaped way over that hurdle. So focus on getting to know him with your clothes on. If he's willing to put in the time to get to know you, then you'll know he's worth your time.
I agree that she didn't just accidentally send a pic of herself in underwear. I've been drunk plenty and honest to god have never done that.
He's going to think you're interested in something else now, not just dates and getting to know each other. I would do some back pedaling and explain that you were drunk (don't use that as the sole excuse though, no one is buying that) and that it lowered your inhibitions and you just wanted him to be interested in you. If he likes you and is interested in you for more than racy pics, he'll laugh it off and let you slow things back down. If he's only interested in sex now, you can't be too upset because that's the signal you gave him. I'd just accept the loss and learn from this and move on if he doesn't appear interested in anything else.