Experts reveal the styles, materials, and colors that are officially outdated—and what they recommend instead.

From Madagascar grasscloth to tessellated shell, “there is just so much to feel,” designer Celerie Kemble says.

A quick anatomy lesson: The glans connects to the shaft, which diverges into two clitoral legs that run beneath the outer labia, creating a wishbone shape. The clitoral bulbs “wrap around the urethral ...