Why?

'Pink tax' angers women from New York to London. 

It's called the "pink tax." The same products have very different price tags, depending on which gender they are meant for. 

Take shampoos as an example. A recent study by the New York City Department of Consumer Affairs found that haircare products for women cost on average 48% more than the same items meant for men.
It found that female razors are 11% more expensive than men's. Jeans cost 10% more. Even toys marketed to little girls are 11% pricier compared to those for boys. 

Women around the world are up in arms about the issue, accusing retailers of "sexist pricing." 

British pharmacy chain Boots was forced to cut prices of some items this week after an online campaign called on the company to stop the unfair pricing. 

The petition showed that identical Boots-branded cream cost £9.99 ($14.50) for women and £7.29 ($10.60) for men. The razors in question were priced at £2.29 ($3.30) for a package of eight women's razors and £1.49 ($2.20) for a pack of 10 men's razors. 

Source: CNN Money