Orally obsessed director Jonni Darkko tests the extreme deep-throat capabilities of 11 gorgeous cocksuckers in “Gag Reflex,” a double-disc celebration of dick-swallowing virtuosity that might leave fans of nasty face fucking and cock worship a little choked up. In nine sensual scenes of alluring POV glamour and full-on, hard-core filth, Jonni’s girls lovingly service throbbing cocks with their talented lips and tongues, slobbering, sucking and, yes, gagging — until the lucky prick can no longer hold back from splattering their stunning faces with messy masses of sperm.