Not very common. But if people incentivize it it's obviously going to become more common. Vaguely relevant recent events: https://amp.theguardian.com/world/20

Not very common. But if people incentivize it it's obviously going to become more common. Vaguely relevant recent events: https://amp.theguardian.com/world/2018/jun/22/mexico-elections-fake-transgender-candidates-disqualified https://amp.theguardian.com/world/2018/jun/22/mexico-electio... https://www.theguardian.com/world/2017/dec/23/two-heterosexual-irish-men-marry-to-avoid-inheritance-tax-on-house https://www.theguardian.com/world/2017/dec/23/two-heterosexu... https://www.telegraph.co.uk/news/2018/05/22/labour-allows-male-activist-stand-womens-officer-identifies/ https://www.telegraph.co.uk/news/2018/05/22/labour-allows-ma...