Regular TSEs are a good idea in particular for males who have had a history of an undescended testicle or who have a family history of testicular cancer.

CNN: Should teen boys check testicles regularly?

Symptoms of testicular cancer may include the discovery of a hard lump (which is usually painless), swelling of the testicle or an achy feeling in the scrotum or abdomen.

CNN: Should teen boys check testicles regularly?

Not a dully personal secret, like an affair or a small crime or, say, a missing testicle but a scientific secret, that rare kind of secret that, in our current age, still manages to bend our knee.

NEWYORKER: The Region of Unlikeness

If the testicle in the groin moves only part way into the scrotum, if the movement causes pain or discomfort, or if the testicle immediately retreats to its original location, it's most likely not a retractile testicle.

CNN: Retractile testicle