[ Lesbian, Gay, Bisexual, and Transgendered ] Open Question : Do most gays support adult consensual incest and polygamy marriages?

I see a lot of gays responses that you can't help who you are attracted to and fall in love with and it shouldn't matter what race, age or gender. What about siblings or cousins who fall in love.Isn't it possible to be in love with multiple people. Do you support polygamy marriage and incestuous marriage? Whether yes or no please state why.