Your question seems incredibly irrelevant. Yes, putting partying people on a party invite seems like the most natural thing to do. The women are clothed, so I'm not sure why you think a shirtless guy is equivalent. But more to the point, I think putting sexy guys having fun on a party invite would make exactly as much sense as this one. But it would have the disadvantage of not showing women that they can show up and have a good time too.

Of everything that you've said on this topic, I agree only with this sentence; neither makes any sense.

P.S. They've unbuttoned their shirts so you can see their muscular pecs. (Note carefully: in my example, they were never shirtless.)