From the Introduction to Fernando Pessoa's Book of Disquiet

Pessoa's sexual abstinence (it is probable, though not provable, that he died a virgin) was by his own account a conscious choice, which he apparently sought to justify in The Book of Disquiet, with passages insisting on the impossibility of possessing another body [and] on the superiority of love in two dimensions (enjoyed by couples that inhabit paintings, stained-glass windows and Chinese teacups).