Decapacitation of spermatozoa occurs in the 

Decapacitation occurs in epididymis as a part of sperm maturation. Decapacitation factors are components of seminal plasma which modulate the fertilizing ability of spermatozoa. This activity arises from the interaction between cholesterol, phospholipids and a fibronectin-like substance. This prevents the premature onset of  capacitation which is supposed to occur in female reproductive tract.