There is no formal test that determines whether one is homosexual or heterosexual (although there are some crude ways one could use to make a judgment). Thus, seminary authorities would have to guess, or ask the question about orientation and assume that the applicant isn't lying.
What is really unfair is little children being molested by their priests and our Church being molested by their presence in positions of responsibility which they abuse.
Those posters are right who have noted that perverse desires indulged even intellectually find a home in the heart and should not find a home in the heart of anyone seeking to obtain or retain the status of priest. Homosexuality is always and everywhere intrinsically disordered according to the teachings of Rome. It has been the teaching from the beginning and it will remain the teaching until the end.
Another point which the quoted Pennsylvania lavender enablers who perform "psychological" interviews to rule out overly "rigid" candidates (i.e. actual Catholic candidates) seem to miss is that this is not about them. It is about whether the sorry excuse for a bishop who hires the unqualified amoral likes of them to screen candidates for the priesthood has any business continuing in the clergy much less as ordinary of his diocese. Purge him and the rest like him now.