Nope you just clench the muscle when its near and keep going like your life depends on it 
It DOES take a lot of practice though, and sometimes you still have a slip so this should never be used as a form of contraception.
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Do not confuse altruism with kindness, good will or respect for the rights of others. These are not primaries, but consequences, which, in fact, altruism makes impossible. The irreducible primary of altruism, the basic absolute, is self-sacrifice - which means: self-immolation, self-abnegation, self-denial, self-destruction - which means: the self as a standard of evil, the selfless as a standard of the good.
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