commute

A shirtless man with curly orange hair holds a condom and says to a woman with brown hair and round glasses, "Help me put this condom on and then we'll make love." She replies, "Is that procedure commutative?" He says, "What?" The caption reads: "This is how mathematicians are conceived." In the votey aftercomic, labeled "Later...", the same woman asks, "Do I have to be pregnant before I have the baby, or can I do that later?" The joke is that the mathematician-minded woman keeps questioning whether the ordered steps of sex and reproduction can be reordered (made commutative).