Two women on yoga class

Two women taking a break in pilates class

Two young men carrying rugs for sunset park party

Giraffeadult male with two females in pre-mating ritual as female urinates and male checks for ovulation, arching his neck across the females, grass and woodland background, Maasai Mara, Kenya

Amata fortuneis mating on Philadelphia Fleabane (Erigeron philadelphicus)

Two young men playing board game at sunset park party

Two boys and a girl using digital tablet at nursery school

Lesser Emperor (Anax parthenopea) mating

Two Nazca boobies (Sula granti), Genovesa Island, Galapagos Islands, Ecuador

Two snails mating

Two men with yoga mats, smiling

Two Indo-Pacific Geckos(Hemidactylus garnotii) mating

Couple in bathtub together

A young boy riding on a ladybug

A mother talking to her daughter

Cross-section of thorax at L3-L4 disc showing relevant lumbar anatomy; two spinal needles illustrate the medial and lateral approaches into the subarachnoid space where the cerebrospinal fluid is located.

A businesswoman walking with her daughter in a stroller

A tea party enjoyed by all

illustration of friends having a party

Artist's concept of the Deep Space Vehicle mated with an Extended Stay Module.

The silhouetted forms of a pair of courting sauropod dinosaurs.

Two ladybugs mating