I disagree. That sort of slide (and its associated comment) is absolutely sexual harassment, in that it automatically sexualizes what is supposed to be a professional environment. Given the technology world's long and unpleasant track record of sexist behavior towards women (as well as towards... well, pretty much anybody who isn't, cisgendered, heterosexual, and male), I personally can think of very few ways that sexualizing a public technology presentation can do anything other than create (or contribute to) a hostile environment for a good chunk of the audience.

Furthermore, that sort of slide sends a clear message to the audience about who the speaker thinks they're speaking to. In this case, it says that the speaker thinks that his audience is composed of heterosexual males[1], which <sarcasm>I'm sure feels just great to any women who might also be in the audience.</sarcasm>

[1]: I'm going to go out on a limb and assume that the author of those conference slides did not include them in an attempt to appeal to the audience's lesbian members. I am, of course, willing to be corrected on this point.