aww-man
Explanation
This comic plays on the gap between romantic expectations and personal desires. In the first panel, a woman is presenting herself in lingerie, and her partner exclaims "Awww mannn..." in what appears to be disappointment. The woman asks what's wrong, and he explains he thought she had gotten him a water slide, but concedes that sex is fine too.
The final panel, labeled "Earlier," reveals that the woman had texted him something suggestive like "Baby, I got you a surprise," which he interpreted as a promise of a water slide rather than a sexual encounter. The humor comes from the absurd inversion of the typical stereotype -- instead of a man being excited by a sexual surprise, he's disappointed it wasn't a water slide, treating an elaborate romantic gesture as a consolation prize compared to a children's toy.