callipygian

adjective2

1. •
   Having beautifully shaped buttocks.

   • […]we soon once more were in a state to renew our delicious combat; and a second course was run in the delightful callipygian recesses of Venus’s second temple of lubricity. — 1873
2. •
   Specifically, describing a statue (often of a goddess such as Aphrodite) in a pose that shows off the figure's shapely buttocks.