Except that it is not that clear;
'God hath imposed a fine on every adulterer and adulteress, to be paid to the House of Justice. Although the term translated here as adultery refers, in its broadest sense, to unlawful sexual intercourse between either married or unmarried individuals (see note 36 for a definition of the term), ‘Abdu’l-Bahá has specified that the punishment here prescribed is for sexual intercourse between persons who are unmarried. He indicates that it remains for the Universal House of Justice to determine the penalty for adultery committed by a married individual. (See also Q and A 49.)'
Source:
Chastity | Bahá’í Quotes
Bahá’u’lláh, The Kitáb-i-Aqdas, p. 200.
Since marriage is defined in the Baha'i teachings as between a man and a woman it is a reasonable inference that homosexual sex will be treated as adultery and subject to a fine.
In my opinion.