Using eggs (typically while laying them) as sex toys.

See also:

• oviposition
• improvised_sex_toy
• sex_during_birth
• blocked_egg: When an egg is pushed back or kept from coming out, sometimes for sexual pleasure.
• blocked_birth: The live birth version of blocked_egg.
• egg_transfer: When an egg comes out of one person and immediately ends up inside another.
• transfer_birthing: Giving birth to something that immediately ends up inside someone else.