Wife is gay
We have worked through the initial steps of suspicion, discussion, and confirmation that your wife is gay. We have explored options: keep on with the ruse; rewrite the terms of your marriage, or get a divorce.
Unless your spouse shares their sexual orientation with you, there is no way to know for sure if they are gay or queer. So-called "signs" like how your spouse talks, walks, dresses, or looks are not indications of sexual orientation. Nor are sexual preferences, including oral and anal sex.