The Dharmaguptaka Vinaya does not prohibit ordination of gay people.
If any monastery following Dharmaguptaka Vinaya would not ordain gay or lesbian people, that’s just because of their misinterpreting the term pandaka or their homophobic and conservative beliefs.
Here is the Dharmaguptaka Vinaya paragraph regarding pandaka :
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受戒揵度之五
Ordination skandhaka, part 5
爾時有黃門,來至僧伽藍中 ,語諸比丘言:「我欲出家受具足戒。」 諸比丘即與出家受具足戒。受具足戒已 ,語諸比丘言:「 共我作如是如是事來。」 比丘答言 :「 汝滅去 !失去 !何用汝為?」
Once, a paṇḍaka arrived at a monastery (saṅghārāma) and said to the bhikṣus, “I wish to go forth and take full ordination.” Then the bhikṣus let him go forth and take full ordination. Having taken full ordination, he said the bhikṣus, “Let us do such and such a thing together.” Thebhikṣus replied, “Be gone, go away! What is the use of you?”
彼復至守園人及沙彌所語言 :「 共我作如是如是事來。」 守園人沙彌語言:「汝滅去 !失去 !何用汝為?」 彼黃門出寺外,共放牛羊人作婬欲事。
The paṇḍaka then approached the monastic attendants and the śrāmaṇeras, saying, “Let us do such and such a thing together.” The monastic attendants and śrāmaṇeras said, “Be gone, go away, what is the use of you?” The paṇḍaka went out of the monastery and committed sexual acts with cowherds and shepherds.
時諸居士見已譏嫌言:沙門釋子并是黃門,中有男子者共作婬欲事。」 時諸比丘以此因緣白佛,佛言:「 黃門於我法中無所長益,不得與出家受具足戒;若已出家受具足戒應滅擯 。
When lay Buddhists saw this, they said in disgust,“The Śākyan recluses are all paṇḍakas. They commit sexual acts together.” The bhikṣus then went to the Buddha about this matter. The Buddha said, “Paṇḍakas do not benefit from my Dharma. They may not go forth and take full ordination. If they have gone forth and taken full ordination, they are to be expelled.”
是中黃門者,生黃門、犍黃門 、妬黃門、變黃門、半月黃門。生者 ,生已來黃門。犍者 ,生已都截去作黃門。妬者 ,見他行婬已有婬心起。變者 ,與他行婬時失男根變為黃門。半月者,半月能男半月不能男。」
There are various types of paṇḍaka: born paṇḍaka, castrated paṇḍaka, envious paṇḍaka, transformed paṇḍaka and semimonthly paṇḍaka. Born means a paṇḍaka by birth. Castrated means becoming a paṇḍaka due to an act of severing after birth. Envious means becoming sexually aroused only at the sight of others committing sexual acts. Transformed means while committing a sexual act with another, he loses masculine function, and thereby becomes a paṇḍaka. Semimonthly means having male function for half a month, and being impotent for the other half of the month.
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Some Chinese Buddhists (not all, but some people like Xuānhuà) think because the paṇḍaka have sex with men, all the gay people is paṇḍaka.
I think it’s out of misunderstanding. Since the Vinaya does saying " There are various types of paṇḍaka: born paṇḍaka, castrated paṇḍaka, envious paṇḍaka, transformed paṇḍaka and semimonthly paṇḍaka. ", none of this means gay people.
( born paṇḍaka: napumsakapandaka ; castrated paṇḍaka: opakkamikapandaka; envious paṇḍaka: ussuyapandaka; semimonthly paṇḍaka: pakkhapandaka. There is no mention of asittapandaka in the Dharmaguptaka Vinaya, only transformed paṇḍaka. Maybe they are the same, and perhaps there are some mistranslations in the Chinese Dharmaguptaka Vinaya when the Dharmaguptaka Vinaya being translated into Chinese. )
And Janet Gyatso pointed out that pandaka are not homosexuals because, “The Vinaya, in fact, goes so far as to distinguish sexual activity between normative males from sexual relations between a socially normative male and a pandaka.”
See note 18: (Defining Buddhism(s): A Reader - Karen Derris, Natalie Gummer - Google 圖書 )
Regarding ordination gay or lesbian people, as far as I know, Chinese Buddhism monasteries usually are reluctant to discuss it, and if they have to answer, they usually discourage it. They maybe accept the ordination, maybe not. I think it depends on the monasteries or situations.
I think the reluctance mainly due to the common social stigma around gay or lesbian people in the Chinese Society.
(p.s. : And Chinese Buddhism monasteries usually discourage lay Buddhists reading and discussing the Vinaya contents and ordination rules, so only the Chinese Buddhism monks are sure of the “unspoken rules” and the actual situation. )