Curable silicone composition and its cured product

A curable silicone composition comprising:

• (A) An alkenyl group-containing organopolysiloxane containing at least two silicon-bonded alkenyl groups and at least one silicon-bonded fluorine-containing substituent having the general formula (1):
• Rf--O--Y-- (1)
• wherein Rf is a perfluoroalkenyl group having 5 to 10 carbon atoms, and Y represents a divalent organic group selected from the group consisting of alkylene groups, arylene groups and alkylene-arylene groups, the total amount of said fluorine-containing substituent being 0.5 mol % or more based on all of the organic groups bonded to silicon atoms,
• (B) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms, and
• (C) a catalyst for addition reaction between silicon-bonded alkenyl groups and silicon-bonded hydrogen atoms, the molar ratio of the silicon-bonded hydrogen atoms of said component (B) to the silicon-bonded alkenyl groups of said component (A) being 0.5 or more.