Would you put your kids in danger to have a once-in-a-lifetime sexual adventure?  You know what . . . it's probably better if you don't answer that.

 

28-year-old Gina Marie Rayner of Peoria, Arizona left her five-year-old and three-year-old alone at her boyfriend's apartment on Sunday night . . . so they could go have a THREESOME in a HOT TUB.

 

Gina . . . her boyfriend, 30-year-old Anthony Vechiola . . . and a 29-year-old woman named Jennifer Duchnowski all got into the public hot tub at Anthony's apartment complex and started getting-it-on.

 

Someone spotted them and called the cops.  And when the cops got there, they could hear Gina's five-year-old crying for his mother.

 

Gina, Anthony, and Jennifer were all arrested and charged with public sexual indecency . . . and Gina could also be facing charges for child abuse. 

 

(Your West Valley

 

(Here are their mugshots. Gina is on the right.)