It seems you're looking to engage in risky sex, meaning without a condom. Why? Without getting into scientific articles, just be logical. Enemas cause more stress on the bowel and intense evacuation, so isn't that just likely to cause some problems in that area for some people? Obviously, yes. You also can have no idea if there are no cuts, nor can you know if you're causing cuts during sex. So again, why are you trying so hard to justify unprotected risky sex? That's the question you want to ask yourself.
No. Administering enemas prior to anal sex is actually associated with a higher risk for HIV and STD transmission. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4011986/