ginkgo
Explanation
This is a single-panel comic showing a couple sitting together under a ginkgo tree on a pleasant day.
One person says: "It's so lovely sitting here under the ginkgo tree." The other responds with an unsolicited biology fact: "Did you know ginkgo biloba trees have motile sperm? They're wriggling around up there right now!"
The caption below reads: "People think they're attracted to intelligence, but there are limits."
The joke plays on the popular claim that intelligence is an attractive quality in a partner -- the idea of being "sapiosexual" or simply finding smart people more appealing. The comic tests this claim by presenting a person who is indeed knowledgeable (the fact about ginkgo sperm is true -- ginkgo biloba is one of the few seed plants that produces motile, swimming sperm cells, a feature more commonly associated with more primitive plants like ferns and mosses). However, the timing and content of the fact make it deeply unromantic. Sharing information about tree sperm wriggling overhead during an intimate, peaceful moment under said tree is the kind of thing that is technically intellectual but practically repulsive.
The comic suggests that people who say they are attracted to intelligence really mean they are attracted to intelligence deployed with social awareness and good timing -- not intelligence wielded indiscriminately in every situation.