sex with ex????

Okay before i do something stupid here is the story... my first ex we been together for a year and he cheated on me and used me for sex and this was freshman year and now it's senior year and I recently got dumped out of a 2 year relationship from my second ex and its been 8 months already and I already moved on from my second ex and i have been talking to my first ex and i have no feelings for him and its been awhile for me and i want to have sex but i want to use him for my own pleasure but I don't want to get risky and get attached but I feel like i wont though but i wanna hear your guys opinion