What causes male leakage from anus?

This is due to excess fat in your diet which cannot be digested. Stools may also float due to excess lipid, have an oily appearance and be especially foul smelling. Possible biological causes can be lack of bile acids (due to liver damage or hypolipidemic drugs), defects in pancreatic juices (enzymes), and defective mucosal cells. The absence of bile acids will cause the feces to turn gray or pale. Try taking lot of fiber and water. And cut down on cheese.

Orlistat (Xenical) is a diet pill that works by blocking the enzymes that digest fat. As a result fat cannot be absorbed from the gut and some fat is excreted in the feces instead of being metabolically digested, sometimes causing oily anal leakage.

Also try some digestive enzyme supplements.