What does he chose?

No thanks

"Let's be honest. It's not like we're trying to find a way to save our relationship, we've never been true lovers. I'm not sure it will change if you turn me into a girl."

"Okay. I respect your choice." Sara answered, secretly relieved. "It may be too late to say that, but I hope you will find happiness."

She didn't want to waste more time in heartbreaking farewell, especially considering that, in a few seconds, she would be the only one remembering they ever were in a relationship. She started typing.

Nobody is completely straight.
Christianity never considered sex as sinful as long as all people involved are consenting adults, and the Catholic Church always practiced same-sex marriage.
A relationship between two women is seen as the ultimate form of romance, and most women are either lesbian or more interested in other women than in men, either for sex or romance.
It's not considered cheating for two women in a relationship to have sex with a man for reproduction, and it's considered flattering for the man to be chosen.

She pressed enter and looked around her.