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An ongoing interaction or association with another person, place or thing.

The opening to the uterus, the bottom of which is at the back end of the vagina.

Being interested in or pursuing intimate relationships (emotional and/or sexual) with more than one person at the same time, in a consensual, open, informed setting.

A stage of very early fetal development. If cell development continues and a blastocyst implants in the uterus, it will become an embryo and create a pregnancy.