I am an Italian son of Noah.
The prohibition of the homosexual intercourses between Gentiles males is an integral part of the Noachide Precepts (see Mishneh Torah-Melacim uMilchamot 9: 5; it does not seem that lesbian relations are explicitly forbidden to Gentiles women ).
Now, in the Babylonian Talmud there is a passage in which the male homosexual intercourse would seem to be related to the specific practice of anal coitus:
GEMARA: From where do we derive the prohibition and punishment for homosexual intercourse with a male? It is as the Sages taught in a baraita with regard to the verse: “And if a man lies with a male as with a woman, both of them have committed an abomination; they shall be put to death, their blood shall be upon them” (Leviticus 20:13): (….) the phrase “as with a woman [mishkevei isha],” referring to lying with a woman, appears in the plural. The verse teaches you that there are two manners of lying with a woman for which one who engages in intercourse with a woman forbidden to him is punished, vaginal and anal intercourse.
I therefore wonder if the halachic sources allow Gentiles males to perform homosexual acts that are different from anal coitus, such as oral sex, mutual masturbation and intercrural coitus, also because Gentiles men are not bound by the obligation of procreation and the prohibition of spread the seed in vain.
I specify that my question has no personal interest, but is exclusively set up for study purposes pertaining to the precise provisions of the Noachide Law.