Having visited Vegas umpteen times I had thus far succeeded in NOT seeing Cirque du Soleil...until now. I had passed on Cirque before, mainly because it's so difficult (or damn near impossible) to get discounted tickets. However, my husband and the other couple we were traveling with were able to get a small discount on 4th row seats for Zumanity.
In case you were in a coma or couldn't figure it out from the other 40-plus reviews before mine, this show has an adult emphasis. This means you will see boobies and various sex acts of all persuasions. Unless you're the product of some sick Oedipal union or want to see a giant rubber dildo waved in your mother's face then don't see this with your parents in tow. And if you answered "yes" to either of the previous statements, you should use Yelp to find a good family counselor.
That being said, if you want to see an adult-themed show in Vegas that doesn't involve bronzed douchebags in rip-away pants or women with painful-to-look-at implants, then I'd recommend Zumanity. Aside from a few cheesy segments, compared to some of the other unfortunate acts like Bite or Thunder Down Under, there is actually some athletic and artistic merit to Zumanity.
I didn't go in expecting anything, so perhaps this is why I wasn't so disappointed as other reviewers were. Sometimes the advertised grandiosity of O or Mystere makes me wretch, so I found the playfulness of Zumanity to be refreshing.