Has been suggested at least like 50+ times.
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You can do this, except for WF+WF and WB+WB marriages.
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Swap gender using 5 points, then swap it again. For example, a female ep and female wr want to get married. The WR can swap gender, using 5 points (2500 ecish), then after it takes effect (few hrs) can marry. Then you can re-swap your gender, so it will be two females again.
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This is just a point sink, they get more people who donate for this reason. Won't be added
but +1