I can't actually find the part about homosexuality in the Ardanes.
Lines 153-155 of the 161 Laws read;
"It has been found that practicing the art doth cause a fondness between aspirant and tutor, and it is the cause of better results if this be so.
And if for any reason this be undesireable, it can easily be avoided by both persons from the outset firmly resolving in their minds to be as brother and sister or parent and child.
And it is for this reason that a man may be taught only by a woman and a woman by a man, and women and women should not attempt these practices together. So be it ordained."
These 161 Laws are NOT the work of Gardner, though. They are directly based on the Ardanes and those were written/delivered by Gardner.
I have checked multiple different copies/versions of the Ardanes and I cannot any equivalent of the 161 Laws entry on homosexuality. The closest is that everything in the Ardanes is spoken of in male/female terms.
The curse of the Goddess is found in the Ardanes, however! Only one entry ever actually mentions what this curse entails;
"And if any break these laws, even under torture, The Curse of the Goddess shall be upon them, so they never be reborn on earth, And may the remain where they belong, in the Hell of the Christians. "