I wish it weren't so, but this year's E3 is expected to be lacking the luster it once did now that an old rule is to be enforced. A policy for the expo has been that:

Material, including live models, conduct that is sexually explicitand/or sexually provocative, including but not limited to nudity,partial nudity and bathing suit bottoms, are prohibited on the showfloor, all common areas, and at any access points to the show.

This year, the show's director, Mary Dolaher, says that this policy will be enforced with fines reaching $5,000 on the spot for offenders. Wired has more on the topic.