Being a Dad
Explanation
The Joke
A father and his young daughter are watching something on a screen (presumably a boy band or male celebrity). The father exclaims: "Whoa. Look at his nearly-symmetrical body, fine motor-control, and blemish-free face!" followed by "His sperm quality must be off the charts!" The embarrassed daughter repeatedly pleads "Dad, stop" and "DAD!"
The caption at the bottom reads: "I can't wait until my daughter is into boy bands."
The Humor
The comic plays on the well-known dynamic of parents being embarrassingly enthusiastic about their children's interests. The twist is that this father, rather than being a typical clueless dad who does not understand teen heartthrobs, is an evolutionary biologist (or at least science-minded) who understands exactly why boy bands are attractive -- and expresses it in the most mortifying scientific terms possible.
The features he highlights (symmetry, motor control, clear skin) are genuinely recognized markers of genetic fitness in evolutionary biology. By translating "he's so hot!" into "his sperm quality must be off the charts," the father demonstrates both perfect understanding of the underlying biology and zero understanding of appropriate social boundaries. The caption suggesting this is something he is looking forward to makes it even funnier -- most parents dread the boy-band phase, but this dad sees it as an opportunity to discuss reproductive fitness with his daughter.
References
The comic references evolutionary psychology and sexual selection theory. Bilateral symmetry, clear skin, and fine motor control are all studied as indicators of developmental stability and genetic quality in mate-selection research. These are the kinds of metrics an evolutionary biologist would use to assess attractiveness, rather than the typical "he's cute" vernacular.