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Sexual reproduction requires an interaction between two germ cells, one female and one male, in the female genitalia. In cases where this process is not accepted for reasons of sexual identity or sexual orientation, we opt for Assisted Reproduction Techniques, as sexuality and the wish to reproduce does not exclusively derive from those biological conditions.
Nowadays, we find such heterogeneous situations and wishes that specific responses to each situation are required, such as a shared pregnancy between two women.