The overall takeaway from the folks who felt compelled to complain about Rihanna to the feds ... the lyrics and choreography were way too sexualized, with some viewers even comparing it to porn.

TMZ obtained the 103 complaints made to the Federal Communications Commission -- a U.S. government agency that regulates television -- regarding this month's Super Bowl broadcast ... and almost all of them had to do with RiRi's halftime show.

One viewer in California even compared Rihanna's set to Kim Petras and Sam Smith's performance at the Grammys, writing ... "I don't care what someone worships but children shouldn't be exposed to pornography and as an adult I don't wish to see it ... Where has decency gone? How about respect for others and self?"

In Utah, one viewer bitched ... "This year the halftime show was so indecent I had to turn off the TV because of the pornographic content."

Meanwhile, folks across the country clutched pearls over the "overtly sexual dancing" and song content heavy on sexual content.

Rihanna was pregnant so she didn't dance much ... and most of the ire was directed at the background dancers, who some say made gestures that "were patently offensive and completely inappropriate for children."

When RiRi did manage some dance moves, they drew complaints too ... with one viewer in Florida complaining, "She spread her a** cheek at the crack. She rubbed her pants where her labia were three times."