The mishna on Kiddushin 82a presents R. Yehudah's opinion that an unmarried man should not be a shepherd or share a blanket with another unmarried man. The chachamim allow it. In the gemara, the argument is connected to and resolved by a braita in which the chachamim said to R. Yehudah that Jewish people are not suspected of homosexuality or bestiality (a position which the Rambam codifies as law).
I don't know the independent location of that braita or if there is any discussion there but it appears then that R. Yehudah's position is that we DO suspect Jews of these desires -- he does not give any response and there is no citation by the chachamim that he can reply to. But the statement in the mishna which is explained by quoting another conversation between the identical players doesn't do anything to flesh out R. Yehudah's position or tell whether he retains a suspicion and if so, what it is based in.
Is there any other discussion which explores why R. Yehudah and the chachamim rule the way they do?