Dax Shepard and Kristen Bell revealed their "ingenious" sex education approach for their two daughters.

Shepard credited Bell for teaching their girls that they are in the "driver's seat."

The parents explained that despite a man's "ridiculous protrusion," their daughters are in control.

The father-of-two wants his children to have sex because they are horny, not for approval.

Shepard and Bell say they bathe their kids only when they stink.

This infrequent bathing trend was first acknowledged by A-Listers Mila Kunis and husband Ashton Kutcher.

Shepard said his kids were bathed nightly. Now, they wait some days before washing them.

Bell said Shepard once nursed from her to unclog her ducts in a breastfeeding emergency.

As Shepard spat the fluid in a cup, Bell was full of love for him.