Kelsey Leigh Gutierrez
Kelsey Leigh Gutierrez, 25, is alleged to have sex with two teenage pupils at her school in Santa Fe, TexasPolice handout

A female teacher seduced two students, having sex with them in her car and in their homes, before rating them on their sexual performance, it has been alleged. Kelsey Leigh Gutierrez engaged in a variety of sex acts with the teenagers over 18 months, according to police in Santa Fe, near Galveston, Texas.

The 25-year-old was sacked from her position as English teacher at Santa Fe High School on Friday 18 November after the claims emerged. Gutierrez has been charged with three counts of having an improper relationship between an educator and a student after the allegations against Gutierrez came to light following a tip-off.

Gutierrez allegedly told police that there were two relationships consisting of multiple sexual encounters.

Court documents seen by local TV station KPRC 2 News claim Gutierrez met with an 18-year-old student on 12 November in a car park where it alleged that they kissed before having sex. Gutierrez is also alleged to have had sex in the teenager's bedroom four days later.

KHOU News reported that the teacher admitted to having a sexual relationship with the student. It has been reported that police found evidence on both of their phones referencing the student's sexual performance.

Court documents also mention a 2015 sexual relationship between Gutierrez, who joined at the beginning of the 2014 school year, and another student who has since graduated. In May last year, the teacher is said to have picked up the second student in her car and kissed him in a petrol station car park.

In a statement, the school said: "Santa Fe Independent School District became aware that a former high school teacher was arrested Monday, Nov. 28, 2016, in connection with allegations that she may have engaged in an improper relationship with a student.

"As soon as the District learned of the allegations, an internal investigation began including campus administrators and the District police department, and the teacher's employment with the District ended.

"We want you to know that we take very seriously any concerns that relate to the well-being of each of our students and our first priority is the safety and education of our students in our district."