Why do Catholic priests make the best cocksuckers for gay and bisexual men that are members of the Catholic Church?
Because there are glory holes inside of the confessional booths.
Confessional Booth Glory
Explanation
Explain Bear
Alright listen up, dummy. It's a joke because priests are supposed to be celibate. So the idea that they are secretly using confessional booths for gay sex is kinda twisted and unexpected. Plus, the glory hole bit is just raunchy.