When a member of the male sex tucks his genitals between his legs then with perferably groomed or ungroomed pubic hair rubs them against a member of the opposite sex. Can also be performed to the face of partner as well.
Zach had just tucked his sack back to give Tya the old toothbrush when he was interrupted by a phone call. To this unpleasentry he told Tya
"Baby I'll show you the toothbrush after this call."