Image of a large assortment of red and pink roses

Photo by Ed Robertson on Unsplash

Mirrored image of a microscopic water flea

Daphnia pulex • Photo by Paul Hebert (CC BY 2.5)

Image of the heart-shaped blossoms of the bleeding-heart flower

Photo by Alli Remler on Unsplash

Image of various fruits arranged to evoke the process of fertilization of a human ovum

Photo by Dainis Graveris on Unsplash

Image of a pink heart-shaped flower with a fly on it

Helicodiceros muscivorus, or dead-horse arum • Photo by emmapatsie (CC BY-NC-ND 2.0)

Image of two grasshoppers mating

Photo by Marisa Barrett on Unsplash

Image of a disconnected electrical plug lying on the floor

Photo by Kelly Sikkema on Unsplash

Image of a replica giant squid on display in a museum

Replica of a giant squid at the National Museum of Nature and Science, Tokyo, Japan • Photo by Momotarou2012 (CC BY-SA 3.0)

Image of two pairs of bare feet emerging from under bed sheet

Photo by Anna Shvets from Pexels

Painting of old man ogling a young woman

Detail from “The Old Man in Love” by Lucas Cranach the Elder (ca. 1530)