Since his death, William Blake has been claimed by those of various movements who apply his complex and often elusive use of symbolism and allegory to the issues that concern them. In particular, Blake is sometimes considered (along with Mary Wollstonecraft and her husband William Godwin) a forerunner of the 19th-century "free love" movement, a broad reform tradition starting in the 1820s that held that marriage is slavery, and advocated the removal of all state restrictions on sexual activity such as homosexuality, prostitution, and adultery, culminating in the birth control movement of the early 20th century. Blake scholarship was more focused on this theme in the earlier 20th century than today, although it is still mentioned notably by the Blake scholar Magnus Ankarsjö who moderately challenges this interpretation. The 19th-century "free love" movement was not particularly focused on the idea of multiple partners, but did agree with Wollstonecraft that state-sanctioned marriage was "legal prostitution" and monopolistic in character. It has somewhat more in common with early feminist movements (particularly with regard to the writings of Mary Wollstonecraft, whom Blake admired).