testicle

Noun

The male sex organ that makes sperm and male hormones; there are two testicles inside the scrotum.

Parts of the body (edit)
head	ears - eyes - eyebrow - nose - mouth - lips - tongue - tooth (pl. teeth) - cheeks - chin
torso	neck - throat - shoulders - chest - breasts - ribs - abdomen - pelvis - back
internal organs	heart - lungs - liver - stomach - kidneys - intestines - bladder - ovaries - uterus/womb
extremities	arms - hands - fingers - legs - feet - toes
sex organs	penis - vagina - testicle - ovary - vulva