I think the expectation that any reference to sexuality is inherently machismo and sexist is disheartening. Nude bodies are beautiful. To acknowledge this is not a sin, not discriminatory, and not automatically immature. To joke about it should not be "politically incorrect." If it makes you uncomfortable, you might look within yourself and not point fingers. We fear what we do not understand. We hate what others have, and what we can nothave. Knee-jerk reactions to sexual references are usually a symptom of jealousy - more bluntly - not getting any.
I don't know the context of this particular case, but to me, sexuality is a big part of life and part of what makes it worth living. It is a large part of what drives us, and I make no apologies for it. The more comfortable we are with discussing it, the better. We don't need to be vulgar, crude, or overly open, but we also don't need to be overly sensitive to prudish sensibilities and people who can't have a laugh.
Showing a nice ass on a slide is not a sign of male privilege. It may or may not be juvenile, depending on the context, but it should not discourage women from becoming interested in computer science any more than the statue of David should discourage men from being artists. This sentiment strikes me as part of our culture of victimhood - as if, after all humankind, individually and as a whole, has overcome, a slide of a beautiful ass can keep a good man or woman down.
#getalife