I didn't notice any sexual harassment this year at either BSidesLV (where I was on the security team both days, and where one of the main organizers is a woman) or at Defcon (although the in-your-face Chippendales posters all over the hotel were annoying). Nor at HOPE. Other than at Bsides, I wasn't actively seeking out bad behavior either, but it wasn't in-your-face if it did exist. (One speaker at Defcon used a James Bond movie hook in a talk about trusted platforms, with "don't get hacked, win the money, and get the girl", but I wouldn't consider that particularly inappropriate -- that it was James Bond makes it less bad than if it were a generic "don't get hacked, get laid" reference.)

Compared to Defcon 1-13, which had pretty pervasive sexual harassment. (Plus more public drunkenness and drug use, too). I was in Iraq during 14-18, so I can't really comment on those.

(This year, at an after-Defcon party on Sunday, the only obnoxiously drunk harassing person I encountered was female, too. That's probably not an improvement for society.)

I do kind of hate how people-with-kids now bring their children to Defcon, and the general push to turn it into "hacker disneyland" (with NSA recruiting there, various "Defcon kids" programs, etc.). I don't think that's related to less sexual harassment, just with the thing being bigger and a lot of participants now being old.

USENIX Security, IETF, and Nanog seem to be the best overall blend of "non-offensive atmosphere", "actual technical content", and smart/interesting people. There's probably a role for something cheaper and similar, maybe an extension of BSides, since as an individual, I'm a lot more willing to pay $100-200 for a conference than $1500-2500.