A couple have been arrested after a man was seen engaging in a sex act on a family beach in Florida after downing Four Loco.

Jeffrey Kernan, 50, 'was performing oral sex on his girlfriend... in front of families and children,' on the Clearwater beach at around 5pm on Sunday afternoon, according to the arrest affidavit, first obtained by The Smoking Gun.

Both Kernan and his girlfriend Alexandria Rowell, 26, were drunk, according to the document.

Scroll down for video

Jeffrey Kernan (left) and his girlfriend Alexandria Rowell, 26, (right) were arrested after families on the beach reported the lewd acts

Kernan, 50, 'was performing oral sex on his girlfriend... in front of families and children,' on the Clearwater beach (pictured) according to the arrest affidavit

The couple were arrested but bizarrely were not charged with public indecency.

Instead, they were book for having an open container of alcohol - a 16-ounce can of Four Loko.

Kernan and Rowell were booked into the county jail Sunday evening. Kernan, of Tampa, posted his $250 bond yesterday and was released.

Rowell, who lives in Winter Haven, remains in custody.

Jeffrey Kernan (left) was said to be drunk, and cops found an open bottle of Four Loko (stock image) next to him on the beach