An athletics coach at a Miami-area high school has been arrested after police said he filmed two 16-year-old students in a sex act, and badgered one of them for sexual favors.

Yuniesky Ramirez-Martinez, 37, was arrested on Monday in Doral on charges including promoting sexual performance by a child, offenses against students by authority figures, and solicitation of sexual battery by an authority figure.

Police say that on Valentine's Day, he enticed two teens who are students at Downtown Doral Charter Upper School to engage in sexual acts while he filmed, before 'fist bumping' the boy and pressuring the girl to perform the same act on him.

Ramirez-Martinez, who also worked at the school as a part-time security monitor, had been hired there just a few months ago, Doral Police Chief Edwin Lopez told NBC Miami.

'Within his first few weeks on the job he's already committing several felonies, so we're glad to put people like this in jail,' said Lopez, who went on to call Ramirez-Martinez 'extremely dangerous.'

According to an arrest warrant affidavit, on February 14, Ramirez-Martinez approached two students and made a lewd remark, then offered to take them to a private place to 'do whatever they want.' 

Ramirez-Martinez then led the young couple to an AV room that had a two-way window, and told them that they could 'do it', according to police.

As Ramirez-Martinez went to the adjacent room and filmed with his phone through the window as one teen performed a sex act on the other, according to the affidavit.

Police say security camera footage shows Ramirez-Martinez approaching the door to the other room moments later, before giving a thumbs up signal and fist-bumping the male student.

Ramirez-Martinez also encouraged the two students 'not to fall in love because they are too young,' the affidavit states.

The next day, police say Ramirez-Martinez approached the female student and told her that he had watched what she did with the male student, and asked her to perform the same sex act on him, arguing that she needed to be with someone more experienced.

When the girl protested and asked whether he knew she was under 18, Ramirez-Martinez responded that he likes minors like her, the affidavit states.

Over the following days, Ramirez-Martinez repeatedly badgered the girl for sex, and threatened to tell the boy that she and himself were sexually active if she refused his advanced, police say.

At that point, the girl went to school officials and told them what had been happening.

Kim Ortiz, the school's principal, said in a statement to NBC Miami that when administrators heard the allegations, they immediately reported them to Doral Police.

'As a result of their investigation, The Doral Police Department arrested Mr. Yunieski Ramirez who was employed as a part-time security monitor and athletic coach,' the statement read. 

'Mr. Ramirez was immediately terminated as an employee with Downtown Doral Charter Upper School and has NOT been on school grounds since the initial report,' the principal added. 

'DDCUS continues to cooperate with all law enforcement authorities and cannot comment further on the investigation.'

According to social media profiles, Ramirez-Martinez is a former high-level beach volleyball player originally from Cuba.

He twice won the gold medal in the men's competition at the NORCECA Beach Volleyball Circuit, according to the Beach Volleyball Database.

Lopez, the police chief, slammed the allegations as extremely disturbing.

'This is somebody who’s victimizing students, who’s preying on them, taking advantage of students who are in a unique age in their life hormonally, dealing with the pressure of social media, the pressure of different relationships,' he told the NBC affiliate.

'You are an authority figure in school, you’re supposed to coach, you’re supposed to mentor, you’re supposed to guide these young men and women into the next phase of life and you’re taking advantage of them, for us it gets no worse than that,' he added.

Ramirez-Martinez was being held in lieu of a $40,000 bond at Turner Guilford Knight Correctional Center on Tuesday evening, jail records showed. It was not immediately clear whether he had an attorney to speak on his behalf.

Doral Police are seeking information from the public regarding any other potential victims in the case.