Another reason for using enemas before butt sex is practical. If there is " something in the pipe," anal stimulation or bearing down during anal sex can bring on. If you're going to do an enema before anal, you need to go all the way with it. Single-serving fleet enemas are not going to get the job done and. common questions I get is about hygiene and clean up before having anal sex. Today, I used fleet enema 4 hours before sex, I took a dump before I used fleet enema, and it felt better and cleaner after fleet enema, then 2.