They have been at war for a long time.

Dating with compensation is prohibited by law.

Sexual intercourse is one of the basic human desires.

They were having sex in secret.

They participated in an orgy party.

He chose to participate in an orgy.

Our family has become multicultural through intermarriage.

Our families have been intermarrying for a long time.

Kimiko is my best friend.

Ikki is my best friend.