Tungsten Balls

You touch a creature that has a functioning penis and a pair of testicles. An unwilling target must succeed on a Constitution saving throw. On a failure, the target's testicles are transmuted into solid, high-density tungsten. The target's movement speed is reduced by half, and they have disadvantage on Dexterity saving throws.

While under the effects of this spell, the target is immune to the Testicular Torsion spell. 

The target can make a Constitution saving throw at the end of each of its turns, ending the effect on a success.