When レズビアン または gay people get married, whose surname is changed?

In homosexual relationships there is usually a "guy" and "girl" (The "guy" is the most masculine one and the "girl" is the most feminine one) I would have to assume that the "girl" gives up the last name. If not then it would be whoever wants to give up their last name.

I believe its the same as heterosexual couples.
Unless they want to keep their names.

It's just the same way with regular couples the person who proposed to you, あなた usually take their last name =]
That's how I think it is unless the other person wants to keep the name.

I think they can choose whose last name they want to keep :)