Romantic or sexual activity between blood-related family members.

Use "inseki" when they're only adopted relatives, step-siblings or step-parent and step-child pairings instead of blood relations.

See also

• Siblings
• twincest
• sisters
• brothers
• brother and sister
• Parent and child
• mother and daughter
• mother and son
• father and daughter
• father and son
• Grandparent and grandchild
• grandmother and granddaughter
• grandmother and grandson
• grandfather and granddaughter
• grandfather and grandson
• Other relatives
• Cousins
• aunt and niece
• aunt and nephew
• uncle and niece
• uncle and nephew
• Self
• selfcest

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