Well, I was talking with a guy about this last night, actually. I'm curious to try it too, and these are the questions I asked. But first, you must understand that there's either "pure" (MDMA-based) ecstasy, or other types of ecstasy that are based on other drugs, such as marijuana based. He told me that MDMA-based ecstasy gives the best high, from his experiences.
Q: How does it affect your sex drive?
A: If you can manage to get a hardon, you'll keep it for hours. (aka your sex drive is raised, apparently)
Q: How does it affect hunger/thirst?
A: People often forget to drink/eat because they don't get thirsty/hungry during the "hardcore" part of the high, so it's best to eat an hour or two before.
Q: Has it ever directly made you stomach-sick?
A: No, but it does make you hotter/sweat more.
Q: Have you ever experienced lock-jaw?
A: No, but when I take the drug, if I grind my teeth, it'll hurt my jaw.
Q: Is it true that the drug can affect your spin[al fluid]?
A: From what I've read, only over chronic use of the drug.
Q: How much does it cost?
A: Around here [Muskogee, Oklahoma] $10 for a "pure" pill (something like that).
Q: How does the drug affect your senses?
A: Overall, you won't think as much. I can't really explain it, but it does slightly blur your vision. I guess you could say it's like wearing fogged glasses.
Q: Is it addictive?
A: It depends on the person, but me nor anyone I've ever known has experienced an addiction to it.
Q: Is it better to do it alone, or with others?
A: There're pros and cons to both. If you do it with others, you're less prone to do something you regret because of the dog. If you are alone, you probably will have more of an opportunity to experience the effects of the drugs, ie. by listening to music, ect.
I can't remember the other questions I asked.
I recommend you read this:
http://en.wikipedia.org/wiki/MDMA