Squeezed Half Lemon – In many cultures, squeezed half lemon was used as a spermicidal. This experiment is mentioned about birth control in the memoir of Casanova. Half a lemon squeezed into a condom made of sheep’s bladder was used temporarily as a cervical cap. Citric acid of lemon acts as a spermicidal, but it was not for those who do not work sparingly. Lemon is still used in many places.