This may not seem fair to you, but the point of a religion is often that one must give up pleasurable things in this life to inherit a reward in the next one. Just as the prohibition of homosexual sex exists, there would also be a prohibition against extramarital sex for heterosexual people.
So it goes like this;
HETEROSEXUAL? Sex bad. Unless married.
HOMOSEXUAL? All sex bad. All intimacy bad. All romance bad.
What a cruel god this is. To f-ck up and f-ck with ten percent of his creation. And then to give free rein to the remaining ninety percent to f-ck with them as well.
Your going to have to take your complaints up with the big man upstairs.